Russia U.N. Ambassador Vassily Nebenzia told reporters he asked the U.S. "to remember they are in Syria illegally," during a closed-door meeting of the U.N. Security Council in New York on Thursday.
Nebenzia said the U.S. was not invited into Syria "and they claim all the time that they fight international terrorism," but that "to confront those who really fight international terrorism" on the Syrian side is "criminal."
A Syrian military source claimed that the planes hit government and ally posts in the village of Khasham, 12 miles northeast of Deir al-Zour, killing and wounding 150, mostly Afghan fighters.
According to CNN, the strikes killed more than 100 pro-government fighters.
The Observatory said that government-allied forces and the SDF were engaged in battles in the eastern Euphrates river when the strikes took place.
The coalition was formed in 2014 after Islamic State took over large parts of Syria and Iraq.
Both the SDF and government forces have been fighting Islamic State militants in Deir al-Zour over the past months.
(Additional reporting was contributed from Beirut.)
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