PMQs: Cameron and Miliband on Crimean Russia referendum
19 March 2014 Last updated at 12:49 GMT
The Crimean referendum on joining up with Russia was both "illegitimate and illegal" and the result could not be accepted, the prime minister has told the House of Commons,
Ed Miliband asked him about Sunday's vote, which was followed by Vladimir Putin signing a treaty incorporating the region into the Russian Federation.
David Cameron said there would be a "very high price in the long term" if other nations turned away.
He also suggested Russia's future within the G8 could be in doubt.