Ukraine crisis: Security tight at Kiev checkpoint
6 May 2014 Last updated at 15:23 BST
With tensions in eastern Ukraine continuing to escalate, security has been tightened around Kiev.
At least nine checkpoints have been set up on roads around the Ukrainian capital, manned by the police and members of the Maidan self-defence units, checking passing vehicles for possible weapons or explosives.
David Stern visits one checkpoint on a road between Kiev and eastern Ukraine.