pTensions remained high in the eastern Ukrainian city of Slovyansk on April 21, after a weekend attack on a checkpoint by gunmen saw three people killed, including two attackers. The incident occurred amid a tentative Easter truce. a class="link" rel="nofollow" target="blank" href="" target="blank"Russia and Ukraine traded accusationsa regarding who was behind the attack.ppThis footage, taken in Slovyansk on April 21, shows pro-Russia activists driving a tank through the city with a Russian flag flying from the vehicle. A pro-Russia activist group remains in control of some government buildings in the city. The self-declared mayor of Slovyansk a class="link" rel="nofollow" target="blank" href=" to Russian President Vladimir Putin to send Russian peacekeepers to the regiona.