Defending an announcement to pull back dozens of American troops from Syria who’d been working closely with Kurdish-led forces in the fight against Islamic State, President Donald Trump said it was time to let others “figure the situation out” there. He nominated a long list of parties. To be sure, the Syrian war, which began in 2011, has attracted plenty of combatants, engaged in the conflict for a variety of reasons.

The U.S.

The U.S. for years provided covert support to Syrian rebels fighting the Syrian regime, with the aim of pressuring President Bashar al-Assad into a political settlement, but it ditched that program in mid-2017. The American military has directly attacked the regime rarely, in response to its alleged use of chemical weapons. The main role of the U.S. has been fighting Islamic State. It began an air campaign against the group in 2014 and sent in ground troops the next year to assist Kurdish forces fighting the jihadists. After Islamic State lost territorial control of the caliphate it had declared, Trump in December 2018 announced that the U.S. would withdraw its 2,000 troops from Syria. In the event, it reduced them by about half.

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Turkey

Turkey has played a complex role in the war. A U.S. ally and supporter of the Syrian rebels, recently it’s worked with regime backers Russia and Iran to formulate joint approaches to the conflict. Turkey is part of the U.S.-led coalition against the Islamic State, but it’s repeatedly attacked the bloc’s most effective ground force, the U.S.-armed Syrian Kurdish fighters of the People’s Protection Units, or YPG. Turkey considers the YPG an enemy because it has roots in the Kurdistan Worker’s Party, or PKK, which has battled for an autonomous region inside Turkey on and off since 1984. Turkey has repeatedly threatened to invade northern Syria to push the YPG away from its border, and on Oct. 9 Turkish troops began crossing into Syrian territory.

Syria’s Regime

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Forces loyal to Assad, backed by Russia, Iran and the Lebanese militia Hezbollah, have managed to reclaim most of the terrain once held by Syrian rebels. Fighting continues in the last pockets held by regime opponents. Assad has defied international pressure and made no concessions to the rebels, insisting they are all “terrorists.” A decisive victory in the war would put him in a favorable position for a redrafting of the Syrian constitution, which the United Nations is pushing for as part of a political process to end fighting.

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Syrian Rebels

Under relentless bombing by Russian and regime forces, the rebels, who once aspired to overthrow Assad, have lost ground and now maintain control over areas in the northwestern province of Idlib. Islamist fighters linked to al-Qaeda, once regarded as among the most effective rebels, are no longer the force they once were. Still, Hayat Tahrir al-Sham, a coalition led by a group once known as the Nusra Front that is fighting to create an Islamic emirate, became the dominant force in Idlib early this year. Its secular counterparts among the rebel forces are struggling to stand their ground in the hope of securing a meaningful role in future peace talks. The likelihood of that happening diminishes as the regime advances militarily.

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Islamic State

The jihadists of Islamic State, who aim to create a puritanical Islamic society, have lost all the terrain they once controlled in Syria. Thousands of captured Islamic State fighters are being held by Kurdish forces. Others who melted into the population have been waging an insurgency in Syria — conducting assassinations, ambushes and suicide bombings — and have begun to reestablish fundraising capabilities there, according to a U.S. government report.

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Syrian Kurds

The YPG seeks autonomy for Syria’s Kurds and has shown a willingness to work with any power capable of advancing that goal. It’s been a force in the battle against Islamic State but not directly against the Assad regime, which has supported the related PKK. The YPG’s successes against the jihadists, and a unilateral withdrawal of regime forces from several Kurdish-majority areas, enabled it to establish control over about a third of Syria, in the northeast. The regime wants it back, not least of all because of the many oil fields there. That, plus the wavering U.S. support imperil the YPG’s position. Restarting suspended negotiations with the regime over autonomy arrangements for Kurdish-majority areas could offer the group a way to advance its cause, although it has lost leverage.

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Iran

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Having achieved its main objective of ensuring the survival of the Assad regime, its main ally in the Middle East, Iran’s interests now are in locking down postwar benefits. Iran, which deployed its elite Islamic Revolutionary Guard Corps to Syria, is expected to keep forces there. It is said to want to establish a land corridor stretching from Iran to Lebanon through Iraq and Syria so that it can more easily transport arms and equipment to its client, Hezbollah, the militant Lebanese group that’s played a major role in the Assad regime’s triumphs. On other fronts, Hezbollah serves as a proxy force for Iran. It can attack targets associated with Israel and the U.S., which Iran considers its greatest foes, without provoking the reaction such a move by a state would precipitate.

Israel

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Israel, which regularly clashes with Hezbollah on the Lebanon border and went to war with the group in 2006, wants to prevent Iran from creating that corridor, establishing a permanent foothold in Syria, and providing Hezbollah with precision-guided missiles or the means to build them. Accordingly, since the war in Syria began, Israel has frequently attacked targets there — “thousands” of them, outgoing military chief Gadi Eisenkot told the New York Times — including Iranian ones.

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Russia

Having turned the war in favor of the Assad regime with its bombing campaign starting in 2015, Russia is the premier power in Syria, and Trump’s decision to reduce U.S. troops strengthened its position. Russian officials say they doubt Islamic State has been decisively defeated, and their ultimate ambition is for Assad to regain full control of Syria. Toward the latter goal, Russia faces the complicated task of mediating among the regime, the Kurds and Turkey. Once its aim is achieved, Russia wants Iranian-backed forces to go. Iran is likely to have a different view, possibly setting up a postwar conflict between the patrons of the winning side.

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--With assistance from Michael S. Arnold.

To contact the reporters on this story: Glen Carey in Washington at gcarey8@bloomberg.net;Donna Abu-Nasr in Beirut at dabunasr@bloomberg.net;Selcan Hacaoglu in Ankara at shacaoglu@bloomberg.net;Henry Meyer in Moscow at hmeyer4@bloomberg.net

To contact the editors responsible for this story: Rosalind Mathieson at rmathieson3@bloomberg.net, Lisa Beyer, Mark Williams

©2019 Bloomberg L.P.

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