The United States has alleged that it has evidence that shows Russia fired artillery targeting military positions in Ukraine.
According to the BBC, the state department has also warned that Russia intends to deliver heavier and more powerful multiple rocket launchers to pro-Russia separatists in Ukraine, a claim that Russia has denied flatly.
The statement comes just days after the U.S claimed that Russia played a role in the downing of the Malaysian Airlines flight MH17 in the rebel-held region of Donetsk in Ukraine.