The question now is how recent critical changes will impact on-the-ground military strategy.
Russia has managed to regain, at least in part, its role as a powerful interlocutor in the Middle East, which it lost after the fall of the Soviet Union.
Caught out by the side effects of the Syrian civil war and deteriorating relations with the EU and the US, Turkey now appears to be in search of South-South cooperation.
Data since 1950s show Americans have always been wary of refugees. A public opinion expert explains current attitudes toward Syrian refugees and what it means for building consensus on policy.
This roundup from our archives explains some of the major conflicts unfolding in the seven countries singled out by Trump's executive order.
Food, water and climate are complex, interconnected systems that when disrupted can cause severe social and political shocks.
Despite the cataclysmic risks of the Cold War, times have never been as dangerous as these since 1945. Freedom and the rule of law are both under threat.
The images we have seen of Aleppo could play an important role in future discourses about the responsibility to protect.
The international community seems totally incapable of stopping the bloodshed in Syria. But we can express our outrage.
The US has met its goal for resettling Syrian refugees in 2016, and will aim to take in 110,000 more in 2017. A migration expert examines whether fears of their arrival are well founded.
A young boy is strapped with explosives and sent to detonate himself and those around him at a school. An expert on terrorism explains how and why children become embroiled in militant conflicts.
Aleppo has 85,000 children. Dozens are injured every week, just like five-year old Omran Daqneesh whose pictures have shocked the world. Many have far worse injuries and will not survive.