As it happened: Ukraine crisis - grip tightens
Key Points
- Russian military gives Ukrainian forces in Crimea until 03:00 GMT on Tuesday to surrender or face assault, Ukrainian officials say
- Russian navy spokesman reportedly denies an ultimatum has been issued
- EU foreign ministers condemn Russian "aggression" in Crimea and demand troops surrounding Ukrainian bases in Crimea withdraw
- Ukraine's interim PM Arseniy Yatsenyuk says any attempt to seize Crimea will fail
- Russian stock prices fall and rouble hits new low against dollar
- All times GMT