Russia has accused the United States of failing to fulfil its obligations under the truce agreement in Syria. 


A defence ministry statement said Washington was using a "verbal curtain" to hide its reluctance to rein in the rebel groups it supports. 


The truce has broadly held since taking effect on Monday although the Russian-backed Syrian army and rebels have accused each other of many violations. 


Meanwhile, the UN has warned there is a "problem" with getting aid into Syria. 


Special envoy Staffan de Mistura placed responsibility on the Syrian government which, he said, had not yet provided the "facilitation letters" that would allow aid deliveries to besieged and hard-to-reach areas. 


A convoy of 20 lorries carrying desperately supplies for rebel-held eastern Aleppo are awaiting clearance at the Turkish border. 


Mr de Mistura said the planned withdrawal of both government and rebel forces from the Castello Road, a major artery running around northern Aleppo into the rebel-held east, was also proving complicated

Source: NNA