KRAMATOVSK, UKRAINE - MAY 03: tyres burn at a pro-Russian activist blockade following an assault by the Ukrainian army on May 3, 2014 in Kramatovsk, Ukraine. Over the past couple of days the Ukrainian army has been assaulting pro-Russian checkpoints in and around Kramatovsk which sits on the edge of Slovyansk, a pro-Russian activist stronghold. (Photo by Scott Olson/Getty Images)
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