The Ukrainian military will review its own reporting on the death of Viktor Sokolov , the commander-in-chief of Russia's Black Sea Fleet. On Tuesday, images of him emerged in which he took part in an online meeting.

"Our troops will re-verify the information," the Ukrainian ministry promised on Tuesday.

The Russian Defense Ministry released images of Sokolov on Tuesday, a day after Kyiv declared him dead . Based on an accompanying press release, the photos appear to have been taken on Tuesday, but this could not yet be confirmed.

Ukraine said 34 Russian officers were killed last Friday during an attack on its headquarters in the occupied city of Sevastopol. Many of them have not yet been identified.