U.S. Vice President Joseph Biden in separate telephone conversations with President of Ukraine Petro Poroshenko and Prime Minister Arseniy Yatseniuk called on the politicians to unite over the ruling coalition, the White House has reported.

"He called on the leadership of Ukraine to unite and restore the public's confidence in the strong ruling coalition and the reform program, as well as accelerate Ukraine's efforts to combat corruption, strengthen justice and the rule of law, as well as fulfill the requirements of the IMF," reads a statement.

The vice president also emphasized the importance of implementing the Minsk agreements by all the parties "as the best way to resolve the conflict." During the conversation the Ukrainian leaders noted "the continuing refusal of Russia and the combined Russian-separatist forces to comply with their commitments as for ceasefire" and expressed the need for providing the OSCE with full access to the territory being under the control of Ukrainian authorities.