1 March 2014 Last updated at 15:17

As it happened: Ukraine crisis

Key Points

  • Russia's parliament has approved a request from President Vladimir Putin to deploy Russian troops in Ukraine
  • The unrecognised new prime minister of Ukraine's Crimea region asked Mr Putin for assistance to maintain peace
  • Pro-Russian protests have been reported in Kharkiv, Donetsk and Odessa - some have led to violent clashes
  • Leading Ukrainian politician Vitali Klitschko has urged parliament to debate national mobilisation
  • Troops believed to be Russian have surrounded key installations in Crimea
  • US President Barack Obama warned Moscow any military intervention would come at a cost to Russia
  • All times GMT

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