Helicopter 'opens fire' in Ukrainian city of Slaviansk

A helicopter has been seen opening fire in the eastern Ukrainian city of Slaviansk, the Reuters agency reports.

It comes amid claims from pro-Russian separatists that the Ukrainian military has launched an operation to re-take the area.

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Cameron offers more Typhoons for Nato air mission

Britain will offer another two Typhoon warplanes to patrol the skies of eastern Europe amid continuing tensions with Russia over the Ukraine cris, David Cameron has said.