"It was inadmissible for whatever reasons it was justified," Nebenzia told reporters, adding that he told the United States "to remember that they are in Syria illegally in fact. They were not invited there."
"They claim all the time that they fight international terrorism, but we see that it goes beyond that.
"To confront those who really fight international terrorism on the ground in Syria is criminal."
The United States said the international coalition carried out air strikes against pro-government fighters on Wednesday to defend its allies in Deir Ezzor.
It accused Syrian pro-government forces of initiating an attack on the US-backed Syrian Democratic Forces (SDF).
The Syrian government complained in a letter to UN Secretary-General Antonio Guterres that the attack "represents a war crime and a crime against humanity."
The US-led coalition was established in 2014 to fight the Islamic State group in Syria and Iraq, but it has bombed troops loyal to Damascus on several occasions.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)