Ukraine crisis: BBC on the ground

As tension remains high in Crimea and the rest of Ukraine, our reporters in the country describe, via Twitter and video reports, how events have unfolded on Wednesday - including the siege of a Ukrainian naval base.

Media playback is unsupported on your device
Media captionThe BBC's Ben Brown says Russian forces prevented him from speaking to Ukrainian staff at the gates

Feeding the sailors in Sevastopol

All calm in Kiev

Diplomatic efforts stepped up

Blockade at Sevastopol's port

Russian vessels on patrol

Possible sanctions against Russia

Tense stand-off in Crimea