The United States said on Thursday that Russia was firing artillery across the border into Ukraine to target Ukrainian military positions in the conflict against pro-Russian separatists.
"We have new evidence that the Russians intend to deliver heavier and more powerful multiple rocket launchers to the separatist forces in Ukraine, and have evidence that Russia is firing artillery from within Russia to attack Ukrainian military positions," State Department spokeswoman Marie Harf said.
Harf, speaking at a regular media briefing, said the information was based on intelligence reports. "I can't tell you what the information is based on," she said.
Read More Ukrainian prime minister resigns
— By Reuters