The first shots have been fired in the standoff between Ukraine and Russia.

Pro-Russian forces - who've taken over an airbase in Crimea - sent a clear warning to Ukrainian soldiers who tried to take their positions back.

But Russian President Vladimir Putin said the military manoevres were not connected to recent events in Kiev.

Moscow claims Ukraine's ousted leader requested troops enter the region.

Meanwhile...

Vladimir Putin says he reserves the right to use "all the measures" necessary in Ukraine.

The Russian President says there are currently no plans to use military force in Crimea - but it remains a possibility.

Vladimir Putin says his military currently has no plans to use force - but any action would be legitimate.

President Putin also denied that Russian soldiers were involved in certain activities, saying anyone could buy a Russian military uniform.