The end of Syria's civil war and the beginning of the conflict over the spoils

With Syria's civil war nearing an end with the takeover of the city of Idlib by Assad's forces and his allies, I do not expect that Syria will soon enter a period of calm and amicably divide the spoils of the war. Russia, Iran, Turkey, and the US have conflicting strategic interests in Syria, which are on a collision course.

Russia has and will continue to play a leading role that will, to a great extent, shape Syria's post-war future. Beyond Syria, however, Russia is determined to fill the vacuum left by the Obama administration and project its power and influence throughout the Middle East, which will precipitate new regional frictions and adversarial rivalries.

Iran is determined to entrench itself militarily in Syria and consolidate a corridor from the Gulf to the Mediterranean. This will continue to invite Israeli attacks (regardless of the transfer of the Russian S-300 air defense system to Syria) to prevent Tehran from achieving its strategic objective, which may well make Syria the battleground between Israel and Iran.

Turkey, which supported the rebels, wants to end the conflict over Idlib peacefully, dreading a new wave of refugees. Turkey is also seeking to prevent the Syrian Kurds from establishing autonomous rule, fearing that its own Kurds would want to replicate it. The violent conflict between Turkey and the PKK, and with the military arm of the Syrian Kurds' YPG, will continue unabated in and outside Syrian territory.

The US has a significant strategic interest in the region and is committed to the security of its allies throughout the Middle East. Although the US should not be the policeman of the world, Syria occupies a special place in that it is strategically located, and its volatility will continue to destabilize the region.

The US' escalating tension with Iran, the growing discord with Russia, and the deepening gulf with Turkey prompted Trump to reverse his initial decision to withdraw American forces from Syria, warning Damascus and its allies Russia and Iran that if they assault Idlib, "the consequences will be dire."

That said, regardless of how the conflict over Idlib is settled, it would be a disastrous mistake if the US leaves Syria to the whims of Putin, Rouhani, and Erdogan. Trump should further augment, rather than withdraw US forces from Syria, push for a diplomatic solution, and play a direct role in shaping the ultimate outcome.