US vice president Joe Biden has warned Russia that "it's time to stop talking and start acting" to reduce tension in Ukraine.

Mr Biden spoke after meeting Ukrainian officials in the country's capital, Kiev.

The vice president also announced the United States will provide an additional $50 million to help Ukraine's beleaguered government with political and economic reforms.

The money includes $11 million to help conduct the May 25 presidential election, including voter education, administration and oversight.

It also will help fund expert teams from US government agencies to help Ukraine to reduce its reliance on energy supplies from Russia. Other technical advisers will help fight corruption.

The White House has also announced $8 million in non-lethal military assistance for the Ukrainian armed forces, including bomb-disposal equipment, communications gear and vehicles.

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