Ukraine crisis: Crimea referendum 'illegitimate'
6 March 2014 Last updated at 16:11 GMT
The move by Crimean MPs to ask Moscow to allow the southern Ukrainian region to become part of the Russian Federation is "illegitimate", according to interim Ukraine Prime Minister Arseniy Yatsenyuk.
The parliament said if its request was granted, Crimean citizens could give their view in a referendum on 16 March.
Arseniy Yatsenyuk told the BBC's Nick Robinson that the "so-called" referendum had no legal grounds.