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