On Thursday, Russian state media announced a cease-fire between the Syrian government and Syrian rebel groups. “Reports have just arrived that several hours ago there was a development that we all have looked and worked for for so long,” Russian President Vladimir Putin said. “Three documents have been signed. A cease-fire between the Syrian government and the armed opposition is one. A package of measures to control the cease-fire is another. And a declaration of readiness to enter into peace talks on a settlement in Syria is the third.” Turkey will act with Russia as a “guarantor” of the peace process, effectively sidelining the United States. Turkey, like the U.S., supports the opposition groups, while Russia is Syrian President Bashar al-Assad’s primary ally. The cease-fire deal will take effect at 12 a.m. on Dec. 30.