Ukraine’s newly appointed navy chief on Sunday defected and pledged allegiance to Crimea’s pro-Russia authorities in a shock move.

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• Washington announces that US Secretary of State John Kerry will travel to Kiev on Tuesday.

• US President Obama speaks to German Chancellor Angela Merkel over the phone, underscoring the “complete illegitimacy” of Russia’s intervention in Ukraine.

• Ukraine’s newly appointed navy chief, Denis Berezovsky, defects from his post and pledges allegiance with pro-Russian authorities in Crimea. Ukraine’s Security Council opens a criminal procedure against Berezovsky, accusing him of treason.

• US Secretary of State John Kerry condemns Russia’s “incredible act of aggression” and warns of “very serious repercussions” from the United States and other countries, including sanctions to isolate Russia economically.

• Britain and France follow the examples of Canada and the US in suspending their involvement in the G8 preparatory meetings in Sochi, Russia.

• Anti-war demonstrations are held in Kiev and several other Ukrainian cities.

• Ukraine mobilises for war, calling up its reservists.

• Ukraine's Prime Minister Arseniy Yatsenyuk says his crisis-hit country is on the "brink of disaster", accusing Russia of making a “declaration of war”.

• Hundreds of armed Russian troops on Sunday surrounded the Ukrainian military base at Perevalne, in the Crimea region.

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