A damaged wall of a school is pictured in rebel-held Ain Tarma, eastern Damascus suburb of Ghouta, Syria September 17, 2016. Picture taken September 17, 2016. REUTERS/Bassam Khabieh
MOSCOW/BEIRUT (Reuters) - Moscow stepped up its war of words with Washington on Sunday, saying air strikes by a U.S.-led coalition on the Syrian army threatened the implementation of a U.S.-Russian ceasefire plan for Syria and bordered on connivance with Islamic State.
The diplomatic dispute heated up on the last day of a seven-day ceasefire marred by a surge of violence as warplanes hit the strategic northern city of Aleppo for the first time since the truce came into effect.
