Syrian rebels said an agreement has been reached with Russia for a ceasefire in Aleppo to evacuate remaining civilians and rebels from besieged districts. The deal will offer some hope of survival to the people of east Aleppo, who the United Nations said on Tuesday had endured a brutal “meltdown of humanity” as forces loyal to the Syrian president, Bashar al-Assad, rampaged through newly reclaimed districts reportedly carrying out extrajudicial killings. The gruesome reports of executions prompted a UN Security Council emergency meeting Tuesday afternoon at the urging of the United Kingdom and France.