During the course of the Syrian Civil War many foreign fighters have been documented to have fought for Syria's rebel forces, either for the Nusra Front, the Free Syrian Army or other factions. Many foreign fighters have also died in the conflict. Fighters include those from the Gulf Arab states, Tunisia (following its own Tunisian revolution), Libya (following the similar Libyan civil war), Bosnia, China, other Arab states, Russia's Chechnya and North Caucasus region, Western countries (despite warnings of radicalism from those governments). The conflict has taken on a largely sectarian bent with foreign Sunnis fighting for the opposition, while foreign Shias fight for the government. Estimates of the total number of foreign Sunnis who have fought for the rebels over the course of the conflict range from 5,000 to over 10,000, while pro-government Shia fighters are thought to number around 10,000 at maximum; observers have noted the "unprecedented" speed at which these numbers have mobilised in comparison to earlier modern conflicts in the Islamic world. Over 600 foreign fighters were killed in the first half of 2013 alone.
One reason suggested for the influx of foreigners in the fight is that the Syrian government took no steps to curtail the inflow of foreigners who then moved to Iraq during the Iraqi insurgency. In the first half of 2012, 700-1,400 fighters were said to have entered Syria. Total foreign fighters are roughly in line with foreign fighters in other Muslim jihads such as Bosnia, Chechnya, Afghanistan (In the 1980s and 2000s) and Iraq at up to 10% of the fighters. Places such as Tunisia had a high number of fighters abroad due to the accessible mobility and expatriates and larger middle class than most other countries. Syria was said to be a breeding ground for fighters as most foreign recruits had little or no combat experience. An analysis of martyrdom videos indicated that of the 600 reported dead in the first half of 2013, less than 20 of the dead fighters were experienced fighters from Afghanistan, Libya, or elsewhere.
On 31 May 2013, Yusuf al-Qaradawi called for a jihad against Syria. It was speculated in the Western media that this could lead to an influx of foreign fighters to the country.
Most fighters travel to Turkey first before slipping across the border with somewhat lesser contingents coming from Lebanon and even fewer from Jordan and Iraq; many of the fighters also use forged passports as they try and escape secret services. Upon entering the country, many of the Islamist fighters were dispersed to the various groups such as Ahrar al-Sham and the Nusra Front. Languages reportedly spoken in rebel camps include: Chechen, Tajik, Turkish, French, the Saudi Arabic dialect and Urdu (Pakistan or India). In regards to the Free Syrian Army, The Guardian reported the recruits to be more secretive. Jihadist internet fora have also been fertile recruiting grounds. The easy access to the country was a reason for the growing number of foreign fighters. Al-Sharq al-Awsat reported that Libyan fighting leader Abu-Yahya indicated an easy travel route for Tunisian and Libyan fighters, who are first trained in Libya to fight in Syria and then smuggled into Syria with the help of militant groups.
Even in July 2013, it was reported that foreign fighters continued to come to Syria and commit atrocities against both supporters and opponents of the government, as well as clashing with moderate rebel groups. This followed President Bashar al-Assad signing into law a bill that would punish anyone entering the country illegally with jail time and a fine. The fine would be between five million and 10 million Syrian pounds.
The total number of foreign fighters was estimated to be the largest for Libyans with several hundred fighters; Saudis numbered at least 330; several hundred Egyptian Islamists; about 300 Iraqis and over 500 Jordananians.
Sunni sheikh Adel al-Hamad said that his son, Abdulrahman, was killed while fighting in Syria and that he had "hoped to fall as a martyr." He added: "He visited Syria once, then he returned to Bahrain where he prepared for his fighting gear and returned to Syria." In response, Interior Minister Rashid bin Abdullah al-Khalifa said that support should be given from the international community and that individuals should not be indoctrinated and radicalised. It follows calls from mosques to join the "jihad" in Syria. There are also Saudi fighters. USA Today reported that over 1,200 death row inmates were sent from Saudi Arabia to fight against the Syrian government.
Mostly Lebanese fighters tend to have their own groups and militias. Members of Fatah al-Islam and the Abdullah Azzam Brigades were also present though they were fighting under independent banners. Many Lebanese fighters for the opposition come from the Sunni stronghold of Tripoli. The city's Sunni cleric Sheik Masen al-Mohammed said: "The struggle for freedom in Syria is our own struggle for freedom. We Lebanese are part of the Syrian revolution, [sic] part of the rebellion. If Syria gains its freedom, then we will also win in Lebanon." He also said of Syrian President Bashar al-Assad that he was an "infidel...It is the duty of every Muslim, every Arab to fight the infidels. There is a holy war in Syria and the young men there are conducting jihad. For blood, for honor, for freedom, for dignity. We know of Palestinian, Libyan and Yemen fighters who are active there."
Libya's Transitional National Government was the first and only UN recognised entity to see the Syrian National Council as the sole legitimate representative of the Syrian people. In December 2011, it was reported in the French media that the former Libyan Islamic Fighting Group's Abdulhakim Belhadj's associate Abd al-Mehdi al-Harati was leading a Libyan group of fighters with rumours suggesting some of the Nusra Front's fighters came from this group. Arms from the recently concluded Libyan civil war were also present in Syria.
Following the first Arab Spring uprising that led to the Tunisian revolution, where the Islamist Ennahda party came to power, many Tunisian fighters also fought alongside the Syrian opposition fighters. In early 2012, Tunisia also withdrew recognition of Syria. Tunisians have also been killed and captured in Syria, with at least five deaths from the town of Ben Guerdane, from where many fighters make their out of Tunisia to Syria. The Syrian government also informed the United Nations of the arrest of 26 alleged al-Qaeda militants, 19 of whom were Tunisian. Tunisians are reportedly a large percentage of the foreign Arab fighters in the country. President Moncef Marzouki's spokesman Adnan Mancer said that the government was trying to follow up on the fate of Tunisians in Syria with the help of international organisations like the Red Cross as it had cut official ties with the government. He said: "Our youth have good intentions, but it is possible they fell into the hands of manipulators."
In March 2013, an inquiry was initiated in the recruiting of Tunisian Islamists. In May, Foreign Minister Othmane Jarandi said that there were about 800 Tunisians fighting for the opposition in Syria. He added that "the repatriation of Tunisians can be facilitated by the embassy in Lebanon after the government makes contact with the Syrian authorities about imprisoned Tunisian citizens."
Rifts within the al-Qaeda subgroups were also exposed by the war. Amongst the various Iraqis fighting in Syria's opposition are Al-Qaeda in Iraq. Its leader Abu Bakr al-Baghdadi also issued a video tape that said his group had merged with the Nusra Front in order to form the Islamic State of Iraq and the Levant. However, Nusra Front disavowed the claim, while Al Qaeda leader Ayman al-Zawahiri ordered them to be separate groups. al-Baghdadi then issued another video tape in which he reject al-Zawahiri's ruling.
Israeli-Arabs were also found to have traveled to Syria and fought for the rebels. At least one returnee, who was reportedly asked to carry out a suicide bombing in Israel, was convicted of "endangering national security." Judge Avraham Yaakov said at a session of the trial at Lod district court that "there's no legal guidance regarding the rebel groups fighting in Syria."
In June 2013, a recently promoted Jordanian Air Force captain was reported to have taken leave from his job and traveled to Turkey in order to fight for the Nusra Front. Yemenis have also fought for both sides in the Syrian battle; Palestinians have also fought for both sides of the conflict with Hamas being more supportive of the opposition and the PFLP-GC supporting the government. A leading Mauritanian jihadist ideologue, Sheikh Abu al-Mundhir al-Shinqiti, has called for support for the Nusra Front. Most recruits are Arabs (Lebanese, Iraqis, Jordanians, Palestinians, Kuwaitis, Tunisians, Libyans, Algerians, Egyptians, Saudis, Sudanese and Yemenis). The largest contingents of about 500-900 fighters come from Syria's neighbors: Lebanese, Iraqis, Palestinians and Jordanians, many of whom fought U.S. forces in Iraq. The second-largest contingent is from other Arab countries in North Africa: around 75-300 fighters from Libya, Tunisia, and Algeria. Al Qaeda leader Ayman al-Zawahiri also called for a jihad in Syria with the main target of message said to be Lebanon, Jordan, Turkey and Iraq.
In response to a flare-up of violence in Xinjiang, China, the Chinese media blamed violence on extremists from Syria. The Global Times reported that members of an East Turkestan faction had traveled from Turkey to Syria. "This Global Times reporter has recently exclusively learned from the Chinese anti-terrorism authorities that since 2012, some members of the 'East Turkestan' faction have entered Syria from Turkey, participated in extremist, religious and terrorist organisations within the Syrian opposition forces and fought against the Syrian army. At the same time, these elements from 'East Turkestan' have identified candidates to sneak into Chinese territory to plan and execute terrorist attacks." It also cited the arrest of 23-year-old Maimaiti Aili, of the East Turkestan Islamic Movement (ETIM), and said that he fought in the Syrian Civil War. Dilxat Raxit, the Sweden-based spokesman for the World Uyghur Congress, replied to the accusation that "Uighurs already find it very difficult to get passports, how can they run off to Syria?" While the Foreign Ministry spokeswoman Hua Chunying did not directly respond to the claims she said that China has "also noted that in recent years East Turkestan terrorist forces and international terrorist organizations have been uniting, not only threatening China's national security but also the peace and stability of relevant countries and regions."
Footage also emerged online of a Chinese rebel fighter in Syria, ne Bo Wang, a Muslim convert who calls himself Youssef. He appeared in a video in the northern Syrian countryside, in which he condemned the Syrian government for "butchering every Muslim here in cold blood, including children and women" and stating that "people have no freedom, no democracy, no security and no respect here, not at all." He also spoke of historical Chinese ties to Syria, claiming that the Chinese government had destroyed the "traditional friendship between the Chinese and Arab people" because they "sell weapons and provide financial assistance to the Assad government." He also apologied for his government's support for the government and warned them that if they continued to do so "all Islamic countries will join together to implement economic sanctions on China."
Former Yugoslavia and Balkans
Muslims from the Balkans region also joined the opposition fight against the government, with some dying while fighting. Many recruits came from Serbia's Sandzak region, particularly Novi Pazar. Several hundred Muslims also traveled from Montenegro, Bosnia-Herzegovina, Macedonia, Kosovo, and Albania, according to Radio Free Europe/Radio Liberty. Many of the recruits were Salafists and, though denied by some Salafist leaders, Resad Plojovic, the deputy leader of the Sandzak muftiate, said that "some organisations and individuals [are recruiting Balkan Muslims]. There are centers or individuals who probably have connections with certain organisations, and they are motivating people. They also may know ways to transport them to the war zone. Let’s be frank. Many here do not even know where Syria is. They cannot know how to go there and get involved in all that is happening there." Anel Grbovic is a journalist from Novi Pazar, said that most fighters from Serbia were removed from the country's two official Islamic communities[which?] before traveling to Syria. "The fact is, there are illegal organisations recruiting people here. The fact is, there are houses where they come together. The fact is, there are facilities where they conduct their religious rituals -- which mean they exclude themselves from the mosque. That means they exclude themselves from the system of the Islamic community and are more easily influenced by some individuals or organisations." As for Albanian Muslims in Kosovo and Macedonia, they fought for the rebels in order to help "Sunni brothers" in their fight. At least one Macedonian fighter said he was recruited via an intermediary in Vienna. From Bosnia-Herzegovina, many Bosniaks joined the Nusra Front as Salafists (Salafism came to Bosnia during the Bosnian War with Saudi financing, though foreign fighters in that war stayed on in the country despite controversy). Some of relatives of the fighters have said that the leader of the predominantly Salafist Bosnian village of Gornja Maoca, Nusret Imamovic, recruited the fighters; however he refused to be interviewed about the allegations. The Director of the Bosnian State Investigation and Protection Agency Goran Zubac said that his office had questioned at least eight men linked to recruiting and sending the fighters to Syria, while he said his office was monitoring the Salafists. "If our priority is to fight against terrorism and these activities are a part of this sector, then you can rest assured that nobody in the State Investigation and Protection Agency is sleeping."
FTV reported that a group of 52 Bosniak fighters went to Syria since the fighting commenced, though 32 fighters returned, while two were killed. An additional nine Bosniaks released a video tape saying they were going to fight in Homs, though they also mentioned the jihads in Iraq and Afghanistan.
Chechnya and Russia
Kavkaz Center reported that dozens Chechens and other fighters from the north Caucasus regions of Russia had joined the fight against the Syrian government. It was even suggested that this group makes up the largest contingent of foreign fighters outside Libya. The leader of one such group, Brigade of Martyrs, Abu Omar al-Chechen, said: "Jihad needs very many things. Firstly it needs money. Much is dependent on money today for jihad. [We] have missed many chances, but truly today there is a chance to establish an Islamic state on Earth." At least 17 fighters from the region were reported to have been killed in Aleppo, while opposition fighters have lauded their fighting skill due the previous First Chechen War and Second Chechen War as well as the insurgent spill over into Ingushetia, Dagestan and Kabardino-Balkaria. The Federal Security Service estimated that about 200 Russian citizens were fighting for the Syrian opposition, while it expressed fears the fighters could carry out militant attacks upon returning. As of early December 2013, the official estimate for Russian citizens fighting for the rebels has increased to 400.
The Chechen-led Jaish al-Muhajireen wal-Ansar, which was said to be cooperating with the Nusra Front, was one of the leading recruiters of foreign fighters. Its online forum was said to show an easy access route, via Turkey, to the battlefield, which brought in more fighters. The Free Beacon also reported that Chechen fighters were bringing with them Russian-made SA-7 anti-aircraft missiles which are shoulder-fired and could be used to target civilian commercial airliners.
Both European converts and immigrant or immigrant children have gone to fight for the Syrian opposition. This includes the Netherlands (with leading number of fighters) and followed by Great Britain, Belgium and France. EU anti-terrorism coordinator Gilles De Kerckhove said that this was a worrying trend as those who return could be more radicalized. EUROPOL Director Rob Wainright issued his 2013 report and said that the returning fighters "could incite other volunteers to join the armed struggle," as well as use their training, combat experience, knowledge and contacts to conduct such activities within the EU. There were also Australians fighting for the Syrian opposition camp, despite warnings from their government that they could be prosecuted for terrorism amid fears they could return home and carry out attacks. Australian security agencies estimated about 200 Australians to be fighting in the country with dozens said to be part of the Nusra Front.
The first European to fight for the Syrian opposition was reported by Der Spiegel to be a fighter for the Free Syrian Army who was "a Frenchman who had just turned 24 and comes from a wealthy family. He just turned up here with his credit card in hand." A Michigan-born U.S.-convert to Islam was also the first U.S. citizen to be killed in Syria, reportedly by the government, as she was taking part in a reconnaissance mission with two Britons near Aleppo. In July 2013, an U.S.-Egyptian man named Amiir Farouk Ibrahim (from Pennsylvania) went missing in Syria, presumed by the media to be fighting with rebel forces. His passport was discovered, amongst others, in an Islamic State of Iraq and the Levant base which had been captured by Kurdish rebels. His family was aware he was in Syria, but his father did not believe that his son had gone there for humanitarian purposes. On 3 August, two Lebanese-Swedish brothers, Hassan and Moatasem Deeb, were killed in a rebel assault on the Abu Zeid army checkpoint near Qalaat al-Hosn, according to their cousin and a Tripoli cleric. Moatasem died as he exploded his suicide vest in a car at the checkpoint and his brother died in the ensuing fighting. This followed their other brother, Rabih's, death in Tripoli the previous year. The cleric claimed that the deaths were not in vain as that the checkpoint had been taken by rebels. A suicide attack on a school where Syrian troops were stationed in Deir al-Zor was said to have been perpetrated by an Australian named Abu Asma al-Australi for the al-Nusra Front. Reports indicated he was from Queensland and travelled to Syria with his wife before sending her back to Australia. A spokesman for the Department of Foreign Affairs and Trade said that the Australian government was aware of the reports that an Australian had killed himself, but could not confirm any of the speculation. He added that the government had concern about its citizens fighting in the country, including with the al-Nusra Front.
Western countries, including the U.K., have provided aid to the rebels. As of November, 2013, there are believed to be approximately 600 fighters from Western countries in Syria. Norwegian terror expert Thomas Hegghammer at the Norwegian Defence Research Establishment who has collected numbers from national security services in 12 European countreis estimated in November 2013 that between 1132 and 1707 Europeans from these 12 countries have gone to Syria to fight, with a majority from France (200–400), the United Kingdom (200–300) and Belgium (100–300).
The Norwegian Police Security Service has estimated that up to 40 Norwegians have gone to Syria to fight, but that the number might be higher. As of November 2013 at least five are presumed dead and some have returned to Norway. Many are recruited through Islamist groups in Norway and fight for groups like Jaish al-Muhajireen wal-Ansar, ISIS and al-Nusra. Both the Security Service and terror experts have expressed worry that returning warriors might pose a future terror threat to Norway.
The Pakistani Taliban said that its fighters, from a variety of countries, were fighting against the Syrian government. They were reportedly working with the Nusra Front and al-Qaeda in Iraq, which have grouped themselves under the banner of the Syrian Islamic Front. The group's commanders said that they sought to fight in Syria in order to foster closer links with al-Qaeda’s central leadership. An unnamed Taliban commander was quoted by Reuters as saying that the group was fighting alongside their "Mujahedeen friends. When our brothers needed our help, we sent hundreds of fighters along with our Arab friends." He added that videos would be released showing the group's "victories" in Syria. Another commander said: "Since our Arab brothers have come here for our support, we are bound to help them in their respective countries and that is what we did in Syria. We have established our own camps in Syria. Some of our people go and then return after spending some time fighting there. The group's spokesman, Abdul Rashid Abbasi, said on 16 July 2013 that its first batch of fighters had arrived in Syria and set up a command and control centre and that another batch of at least 120 fighters were expected to join the others within a week. While a militant said that 100 fighters had reached Syria and another 20 were on the way with an untold number of volunteers waiting, the Foreign Office spokesman Aizaz Chaudhry said: "We have seen these reports in the media and the concerned authorities are verifying these claims by the militants." However, the Syrian National Council released a statement that read: "We ask for clarification regarding coverage that reflects poorly on the Syrian revolution, particularly news about Taliban's office in Syria and other news items about Islamist fighters." It also cited the Taliban's Shura Council as denying the news and calling it a "rumor." Specifically, Ahmed Kamel said the reports of the Taliban's presence were a "systematic" and "rapid" campaign by pro-government outlets to "smear" the rebels. He said that these were "sick attempts to make the Syrian people look like a bunch of radical Islamists. Syria is bigger than all of these lies and we know, based on our contacts inside Syria, that no Pakistani Taliban are fighting alongside the Syrian rebels. The Taliban want to kill Americans and Israelis, so why they should go to Syria when we are fighting for freedom, democracy and justice against a tyrant?" 
Other Non-Arab fighters came from Turkey, Tajikistan and Pakistan. Though they were reported to be callous, under-trained and poor, particularly in comparison to the Chechens. Other Muslim contingents included: South and Central Asians (Afghans, Bangladeshis and Pakistanis), Westerners (Belgian, British, French, U.S., Australia, Denmark, Germany, Netherlands, Sweden, Canada and Austria), as well as Azerbaijan (ironically since a majority of the Azeri Muslim population is Shia), Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan.
On 3 July 2013, it was reported that Syrian aircraft had dropped leaflets over areas in Idlib province calling on both rebels to turn themselves over to the authorities and for foreign fighters to return to their countries.
The director of the U.S. government’s National Counterterrorism Center Matthew Olsen told the Aspen Security Forum that an increasing number of foreign fighters from the West were fighting for the Nusra Front and that they were "the most capable fighting force within the opposition. Syria has become really the predominant jihadist battlefield in the world. We see foreign fighters going from Western Europe and, in a small number of cases, from the United States to Syria to fight for the opposition." He, along with other speakers, speculated that there was an increased threat of attacks should the fighters return home. The European Union's counter-terrorism coordinator, Gilles de Kerchove, said that about 600 fighters had traveled from Europe to Syria and that should the Balkans and North Africa be counted there would be thousands of fighters. Olsen added that "the concern going forward from a threat perspective is there are individuals traveling to Syria, becoming further radicalised, becoming trained and then returning as part of really a global jihadist movement to Western Europe and, potentially, to the United States."
Despite former Egyptian President Mohamed Morsi's call for a jihad in Syria, the interim leadership in the country said that it had no intention of calling for such a jihad and that it would re-evaluate Morsi's cutting of diplomatic relations with Syria. On 8 July, following the 2013 Egyptian coup d'état, amid fears that many fighters were going to Egypt in support of the Muslim Brotherhood, Egypt put travel restrictions on Syrian entering that country and required a visa before they entered Egypt.
Saudi Grand Mufti Abdulaziz Al al-Sheikh called for Syrians to be "enable[d]" to protect themselves. He also said of fighters going to the country that "this is all wrong, it's not obligatory. I do not advise one to go there...you will be a burden to them, what they want from you is your prayer. These are feuding factions and one should not go there. I do not advise one to go there...Going to a land that you do not know and without experience, you will be a burden to them, what they want from you is your prayer. Muslim should be fearful of God and not deceive young Muslims and exploit their weakness and lack of insight and push them to an abyss. I advise them to advise as they would advise their sons." This was seen as a Saudi fear of its citizens returning home with skills they learnt against the Saudi state.
Turkish intelligence supported Islamist radicals like the al-Nusra Front and aided their passage into Syria and supported arming the rebels. Then President Abdullah Gul said Syria risks becoming "Afghanistan on the shores of the Mediterranean" and that Turkey could become a Mediterranean Pakistan.
French Interior Minister Manuel Valls said that French national fighting for extremist groups could become enemies of France when they return to home.
Western reactions have generally been of concern for blowback from the returning Islamist foreign fighters. Former U.S. Ambassador to the United Nations John Bolton said: "The balance of power within the Syrian opposition between responsible forces and terrorists is already murky at best. If even more al Qaeda supporters are moving in, it raises the risks of supplying weapons even to ‘friendly’ opposition forces even higher." Former CIA official and former staff member of the White House National Security Council Bruce Riedel added: "Syria is the new epicenter for the global jihad with would be ‘martyrs’ arriving from across the Islamic world to fight Assad. [sic] They are getting experience in the terror arts they will bring home." Aaron Zelin of the Washington Institute for Near East Policy wrote that "not everyone who has joined the Syrian rebels is al Qaeda, and only a small number may ever become involved in terrorism after returning to Europe. That said, it would be wrong to conclude that individuals who have trained and fought in Syria pose no potential threat. Numerous studies show that individuals with foreign training and/or fighting experience have featured prominently in European based terrorist plots. [Other studies have shown that foreign-trained fighters] are far more lethal, dangerous and sophisticated than purely domestic cells." He suggested a recurrence of roving attackers that followed the Iraq war in the 2000s, the Bosnia war in the 1990s and the Afghanistan war in the 1980s.
The Free Beacon suggested the growing number of foreign fighters was indicated by the release of videos such as one showing the execution of three Christians, including a Roman Catholic priest. Other such videos are the increasing number of "martyrdom announcements." The New York Times suggested the influx of foreign Islamist fighters could make Syria a new haven for such fighters akin to Afghanistan, Pakistan and Yemen.
Turkey were said to be concerned about the presence of radical jihadists on their border with Syria.
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