Media playback is unsupported on your device

Russia in new Ukraine attack threat

23 April 2014 Last updated at 22:42 BST

Moscow has again warned that it will retaliate if it judges that the interests of Russian people are being threatened in Ukraine.

Russian troops have begun military exercises close to the border with Ukraine while Nato forces are conducting exercises in Poland.

The BBC's Daniel Sandford reports from eastern Ukraine.

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.