Pro-Russian rebels shot down two Ukrainian helicopters on Friday, May 2, 2014, killing two crew members, as troops tightened their siege of separatist-held Slovyansk.
ພາບຫຼ້າສຸດ ຈາກ ຢູເຄຣນ
![A pro-Russian separatist guards a checkpoint as tires burn in front of him, near the town of Slovyansk, Ukraine, May 2, 2014.](https://gdb.voanews.com/1974f37a-4280-45e5-a31d-8267dd7df0d0_w1024_q10_s.jpg)
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A pro-Russian separatist guards a checkpoint as tires burn in front of him, near the town of Slovyansk, Ukraine, May 2, 2014.
![Pro-Russian gunmen listen to instructions from their commander (center) behind barricades in Slovyansk, May 2, 2014.](https://gdb.voanews.com/9047f7e7-d5df-4d8f-a8ce-574c53e871cb_w1024_q10_s.jpg)
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Pro-Russian gunmen listen to instructions from their commander (center) behind barricades in Slovyansk, May 2, 2014.
![A pro-Russian rebel aims his rifle at a checkpoint near a Ukrainian airbase in Kramatorsk, eastern Ukraine, May 2, 2014.](https://gdb.voanews.com/2b738f92-a6fb-4f76-b9b3-0c6db3a61da3_w1024_q10_s.jpg)
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A pro-Russian rebel aims his rifle at a checkpoint near a Ukrainian airbase in Kramatorsk, eastern Ukraine, May 2, 2014.
![Ukrainian troops guard a checkpoint near the town of Slovyansk, May 2, 2014.](https://gdb.voanews.com/cc426000-7f38-48ed-a787-d8c3703809a0_w1024_q10_s.jpg)
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Ukrainian troops guard a checkpoint near the town of Slovyansk, May 2, 2014.