KIEV, April 23 – UDAR Party leader Vitali Klitschko said during his meeting with U.S. Vice President Joe Biden in Kiev that he wants the United States and Europe to impose new tougher sanctions against Russia to stop its aggression against Ukraine.

Klitschko said that Biden's visit to Ukraine again proves that the United States plays a leading and constructive role in the settlement the crisis, which started with Russia's occupation of Crimea and resulted in the destabilization of the situation in eastern Ukraine, the UDAR party press service reported, quoting the party leader.