Russian marine corps trains mobilised troops to use armoured personnel carriers on Kaliningrad Baltic Coast

This video purports to show Russian Marine Corps soldiers training mobilised troops to use armoured personnel carriers on the beaches of the Kaliningrad region between Poland and Lithuania.

The footage begins by apparently showing a heavy machine gun being loaded with ammunition on top of an armoured personnel carrier before its crew climbs aboard and it begins moving, opening fire at mock targets in the water, on the Kaliningrad coast.