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
Live text
Reporting:
- Simeon Paterson
- Jeremy Gahagan
- Mohamed Madi
- Patrick Jackson
Last updated 1 March 2014
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