Earlier, John Kirby, spokesman for the US Department of State, said the US suspends the use of "bilateral channels" with Russia, created to maintain the ceasefire in Syria.
Syria has been suffering from an armed conflict since March 2011, which, according to the UN, has so far claimed over 500,000 lives. Militants from various armed groups are confronting the Syrian government troops. The IS, YPG and PYD are the most active terrorist groups in Syria.
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