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Russian troops fire into air as Ukrainians march on Crimean airbase

4 March 2014 Last updated at 10:00 GMT

Russian troops guarding Crimea's Belbek airbase fired into the air as Ukrainian soldiers previously stationed there marched towards them.

Elsewhere in Crimea, two Ukrainian warships are reported to be blocked by a Russian minesweeper in the port of Sevastopol.

The Ukrainian navy headquarters in the city was surrounded by pro-Russian gunmen and civilians who formed a human chain.

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