Turkey and Russia have been on opposite sides of the conflict, with Turkey arming fighters opposed to Russia’s ally Assad. Last November, Turkey shot down a Russian military jet it said had violated its airspace, prompting a rupture in relations. Following an attempted coup against him over the summer, though, Turkish President Recep Tayyip Erdogan paid his first post-coup visit to Moscow, where he met with Russian President Vladimir Putin and began to mend the rift. Last week, Turkey and Russia brokered a deal with Syrian rebels, and without the United States, to evacuate civilians from Aleppo; the foreign and defense ministers from Russia, Turkey, and Iran are still scheduled to meet in Moscow on Tuesday to discuss the situation.