Russia warned it will act unilaterally starting on Tuesday to end alleged violations of the "cessation of hostilities" agreement, unless Moscow and Washington urgently reach an agreement to deal with attacks.
Al Jazeera: Russia threatens force against Syrian truce violators
Russian soldiers work behind their screens on March 17, 2016 in Russia's reconciliation center as they monitor the truce in Syria at the Hmeimim air base in the Latakia province. \u200f
