The U.S.-led coalition said its warplanes or "partnered forces" may have been behind strikes that killed up to 28 civilians in eastern Syria.
The U.S.-led coalition is tasked with battling ISIS, but it has occasionally clashed with pro-Syrian government forces also battling the jihadis.
“The actions of the U.S. coalition do not comply with legal norms. Beyond all doubt, it is an unprecedented act of aggression,” one Russian senator said.
The U.S.'s highest-ranking enlisted soldier said the coalition would beat ISIS fighters to death with shovels if they didn't give up.
“It was all theater,” said the U.S.-backed commander who has since switched his allegiance to Turkey.
The divide between Lib Dems and Conservatives is growing rapidly as the general election approaches