Humanitarian aid has been cut off to thousands of people as the city of Aleppo, Syria, has fallen under government siege, NBC News reported.
Russian airstrikes, which have increased in recent days, have also killed an estimated 150 civilians, according to U.S. officials on Friday.
The bombardment has also interrupted U.N.-led peace talks scheduled in Geneva this week. Officials said Russia and Syrian President Bashar Assad were not in compliance with a U.N. Security Council resolution that called for access for aid workers and to end bombing of civilians.
