Ukraine's Prime Minister, Arseniy Yatsenyuk, is accusing that Russian military forces and equipment have entered Ukraine.
He says tanks, rocket systems, and radio electronic intelligence systems are not the kinds of weapons available in local street markets in Donetsk.
Russia has not responded to the comments yet.
The report comes as tensions are escalating in the eastern Ukrainian as battles for Donetsk airport continue.
The airport was claimed control by both government army and rebel forces.
