After nearly six years of uprising, conflict and chaos, the partition of Syria is imminent. President Bashar al-Assad will of course rail against it; his crucial ally Iran will probably resist too, and the marginalised US won’t even acknowledge the prospect. But the lines are nonetheless being drawn.

With pro-Assad forces back in control of Aleppo city, a newly co-operative Turkey and Russia are ready to pursue partition as a short-term resolution. The Syrian opposition and many rebels will embrace it as their best immediate option, and the leading Kurdish political and military groups will settle for whatever autonomy they can get. If things continue shaping up this way, by the end of 2017, Syria will quite probably become a country of four parts.

The Russia- and Iran-backed Assad regime is set to hold much of the south and west, and most of Syria’s cities. There’ll most likely be a Turkish/rebel area, effectively a ‘safe zone’, in parts of northern Syria; the Syrian opposition will probably control Idlib province and possibly other pockets of territory in the northwest; while the Kurds will have some form of autonomy in the northeast.

The deal

The turning point for partition came in August 2016 when Turkey and Russia began to reconcile. The two countries had always been on opposite sides of the conflict, Turkey supporting the opposition and rebels and Russia Assad. Their relations had been tense since November 2015, when Ankara’s jets shot down a Russian warplane near the Syrian-Turkish border. But within a year, both saw the advantages not only of reconciliation, but of agreeing on what their respective spheres of influence in Syria should be.

A deal was quickly established: Turkey would accept the reoccupation of all of Aleppo city by pro-Assad forces, supported by Russian-Syrian siege and bombing tactics, while Moscow would accept a Turkish military intervention alongside rebels in northern Syria, including much of Aleppo Province.

The cooperation led to a nominal ceasefire on 30 December, although this was immediately broken by pro-Assad forces in offensives near Damascus and this week's political talks, including the Assad regime and the opposition-rebel bloc, in the Kazakhstan capital Astana.

So can the Turkish-Russian initiative win over (or put down) everyone else who has a stake in the outcome?

The obstacles

The biggest immediate challenge is in the opposition-controlled areas near Damascus. The Assad regime has already taken back many of the suburbs, but two key areas are still beyond its control: Wadi Barada to the northwest, and East Ghouta and Douma to the northeast.

Wadi Barada is home to the al-Fijah springs, which provide more than 60 per cent of Damascus’s water. Since mid-December 2016, the Assad regime’s forces and Hezbollah have been trying to overwhelm it with bombing, shelling, and ground assaults. In the process, the pumping station for the springs has been damaged, cutting off or limiting water to about 5.5 million people. Turkey is critical of the offensive, Russia is staying silent, and the Iranian government and possibly its military are backing it.

Then there’s the Syrian Kurdish movement. The most powerful Kurdish party, PYD, would like to unite its area in the northeast with a Kurdish canton in the northwest, while Turkey would like to push back any Kurdish zone of influence and elevate other Kurdish groups over the PYD. With the Assad regime opposed to Kurdish autonomy of any sort, the only agreeable option may be containment: Turkey will probably accept a Kurdish area east of the Euphrates River, limiting any zone of control or potential military advance. The PYD, knowing it has no powerful backing, will accept the offer, even if it isolates the Kurdish area in and near Aleppo city.

As for Assad himself, the Syrian opposition continues to demand that he step down – but few others are bothering any more. The US effectively gave up the cause in 2012, Saudi Arabia and the Gulf states have gone quiet, and Turkey seems not to care much. He may one day be offered the chance to step down peacefully when elections are arranged, but in the meantime he will stay where he is.

Confronted with the increasingly effective Turkish-Russian axis, a US official opted for condescension: ‘So this country that essentially has an economy the size of Spain, that Russia, is strutting around and acting like they know what they are doing. I don’t think the Turks and the Russians can (negotiate) without us.’

This is pure bluster. For three years now, Russia has been feigning co-operation with the US, and in the process has deftly manoeuvred its Western rival onto the sidelines. If Washington pushes back too hard, it could wreck its relationship with Turkey, which grants it access to key airbases, and end up framed as the main obstacle to a major breakthrough.

The events of the last seven months have only reconfirmed what’s been clear for some time: there is no optimal solution to the Syrian crisis. Partition is far from ideal, and it may only be short-term — but at this point, it’s the only viable alternative to endless slaughter, displacement, and destruction.

Professor Scott Lucas

Professor of International Relations, Department of Political Science and International Studies