Moscow continues to step up its war of words with Washington. It said the US-led airstrikes on the Syrian army threatened the US-Russian ceasefire.

Russia's Foreign Ministry has urged Washington to exert pressure on the illegal armed groups under its patronage to implement the ceasefire plan unconditionally.

It added that otherwise the implementation of the entire package of the U.S.-Russian accords reached in Geneva on September 9 may be jeopardized.