A Ukrainian military helicopter Mi-8 crashed late on Wednesday, killing all four crew members.
Ukrainian land forces confirmed the incident on Thursday, but are yet to reveal the exact cause of the crash.
On its Facebook page, Armed Forces of Ukraine said it lost connection with helicopter late on May 29.
Rescuers and law enforcers are working at the site.

Iran sends proposal for negotiations with US to mediator Pakistan
Iran threatens painful response if US renews attacks
Ukrainian drones hit Russian port of Tuapse for the fourth time
Detained Myanmar ex-leader Suu Kyi to meet legal team this weekend
UK police charge man over stabbing attack in London