Photo from UNIAN

The military, who contacted the relatives of Sonko, told that the bodies of three Marines were kept by the militants.

"Yesterday, there could be an exchange. The commission from Kyiv drove up to a checkpoint, was waiting for them, and then the militants wrote they would not hand over the bodies. Talks on the bodies should be held today or tomorrow," Serhiy said.

Read alsoUkraine reports 1 KIA, 2 WIA in past 24 hoursSerhiy Sonko was 23 years old. About a year ago, he decided to join the army to defend Ukraine. He was the commander of the Third Division of the Marine Corps. At the same time, Serhiy studied at the Faculty of Law in absentia. His mother lives in Kherson, and his girlfriend resides in Mykolaiv.

Another two dead soldiers, according to sources, were 30-year-old Serhiy and 54-year-old Mykola.

As UNIAN reported earlier, on January 8, three Ukrainian servicemen were reported MIA's near the demarcation line in Donbas. A search operation lasted for a few days.