Russia fires its first shots in Crimea as soldiers warn off Ukrainian troops advancing on occupied airfield to demand their jobs back

Dozen Russian soldiers fired warning shots at unarmed Ukrainian troops
Standoff took place as 300 Ukrainian soldiers marched to Belbek air base
The Ukrainians were employed at air base before Russians seized control
Stand-off comes as both Russia and Ukraine send warships towards Crimea
Head of Ukraine's security service says cyber attacks have also taken place
Valentyn Nalyvaichenko blames illegal telecommunications equipment he says was installed in the Crimea by Russian forces over the weekend
Russian troops in control of the Belbek air base in Crimea fired warning shots into the air as around 300 Ukrainian soldiers, who previously manned the airfield, demanded their jobs back.
About a dozen Russian soldiers at the base warned the Ukrainians, who were marching unarmed, not to approach.
They fired several warning shots into the air and said they would shoot the Ukrainians if they continued to advance.