Ukraine Cracks Down on Pro-Russian Separatists

Ukrainian Army troops receive munitions at a field on the outskirts of Izyum, Eastern Ukraine, April 15, 2014.

Ukrainian soldiers stand near APCs, that fly a Ukrainian flag, as army troops receive ammunition in a field on the outskirts of Izyum, April 15, 2014.

Ukrainian soldiers are seen near a MI-8 military helicopter and armored personnel carrier at a checkpoint near the town of Izium in Eastern Ukraine, April 15, 2014.

Ukrainian soldiers are seen near armored personnel carriers at a checkpoint near the town of Izium in Eastern Ukraine, April 15, 2014.

A Ukrainian soldier stands guard at a checkpoint near the city of Barvenkovo in the Kharkiv region of east Ukraine, April 15, 2014.

Ukranian troops stand guard at a checkpoint near the city of Izium in the Kharkiv region of east Ukraine, April 15, 2014.

Members of the Ukrainian Interior Ministry walk past armored personnel carriers at a checkpoint near the town of Izium, eastern Ukraine, April 15, 2014.

Pro-Russian protesters sit at barricades at the police headquarters in Slaviansk, April 15, 2014.