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A Ukrainian security force officer is deployed at a checkpoint set on fire and left by pro-Russian separatists near Slaviansk

Ukraine forces kill up to five rebels, Russia starts drill near border

By Aleksandar Vasovic and Alexei Anishchuk SLAVIANSK, Ukraine/ST PETERSBURG, Russia (Reuters) - Ukrainian forces killed up to five pro-Moscow rebels on Thursday as they closed in on the separatists' military stronghold in the east, and Russia launched army drills near the border in response, raising fears its troops would invade. The Ukrainian offensive amounts to the first time Kiev's troops ha…