The US and Russia say they want to extend the ceasefire they have brokered in Syria. <br /><br /> But the truce looks shaky, undermined by increasing violence and a failure to deliver aid. <br /><br /> Moscow says UN Security Council backing looks unlikely because the US does not want to share documents about the agreement with the body.<br /><br /> A closed door briefing to the Council was cancelled on Friday at the last minute.<br /><br /> “We are ready to extend the ceasefire for another 72 hours,” said Viktor Ponzikhir, Deputy Head, Russian General Staff’s Main Operations Command.<br /><br /> “We are expecting from the American side decisive actions aimed at influencing armed groups under its control in order for them to strictly abide by the September 9 agreement. Otherwise the situation in Syria can get out of control.”<br /><br /> The main dispute of the truce so far is over aid for Aleppo.<br /><br /> Pro-government forces encircled the rebel zone this month, trapping civilians there – with no way to bring in food. <br /><br /> The White House said on Friday that it was deeply concerned that the government continues to block the flow of humanitarian help, despite a decrease in violence following the truce.<br />
