Ukrainian Prime Minister Arseniy Yatseniuk has said that directives for four-party talks in Geneva on April 17 for Acting Ukrainian Foreign Minister Andrei Deschytsia will be agreed at a government meeting on Wednesday.

"There is one single main directive - the Russian government must immediately withdraw its reconnaissance and subversive groups, condemn terrorists, and demand that they vacate the premises and administrations, if Russia wants to stabilize the situation, which I very strongly doubt," he said, while opening a government meeting on Wednesday.

He said that "Russian special services directing all these terrorist operations" is an international crime.

"Tomorrow we are ready to hold the first meeting with our Western partners in such a format with the Russian Federation," he said.

Yatseniuk noted that such a meeting should help stabilize the situation in Ukraine and stop terrorist activity, "which is supported by Russia."

He said that today's events pose a threat not only to Ukraine and its citizens, but also to Europe.

"Our message to Russia - stop supporting terrorists," he said.