The US Vice President, Joe Biden, has visited Ukraine in a public show of support for its embattled government.

Biden met with Arseny Yatseniuk, Ukraine's acting prime minister, on Tuesday and said that Russia should stop talking and start acting to disarm pro-Russian activists.

"No nation has the right to simply grab land from another nation - no nation has that right - and we will never recognise Russia's illegal occupation of Crimea, and neither will the world," Biden said.

Al Jazeera's Barnaby Phillips reports from Kiev.