This handout picture taken and released by the Prime Minister press service on May 22, 2014 shows Ukrainian National guard troops taking part in an exercise in presence of acting Ukrainian Prime Minister on the shooting range not far from Kiev. Rebels firing mortar shells and grenades killed 14 Ukrainian soldiers today, the blackest day for the military in its fight against a pro-Russian insurgency, dramatically heightening tensions just three days before a crunch election. (Photo by Andrew Kravchenko/AFP Photo)
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