Ukrainian soldiers arrive to reinforce a checkpoint which troops seized in the early morning in the village of Andreevka, 7 kms from the centre of the southern Ukrainian city of Slavyansk, on May 2, 2014. Ukraine's military lost two helicopters and two servicemen on May 2 in a deadly offensive launched just before dawn against pro-Russian rebels holding the flashpoint town of Slavyansk, insurgents and authorities said. AFP PHOTO / VASILY MAXIMOV        (Photo credit should read VASILY MAXIMOV/AFP/Getty Images)