“After the hit of the headquarters of the Russian Black Sea Fleet, 34 officers were killed, including the commander of the Russian Black Sea Fleet,” the Ukrainian Special Operations Forces said in an update Monday, adding that more than 100 other Russian servicemen were wounded.

Sevastopol, home to Russia’s Black Sea Fleet headquarters, is one of the largest cities on the Crimean peninsula and was illegally annexed by Moscow’s forces in 2014.

CNN cannot independently confirm Ukraine’s claims about Solokov or the number of casualties.

CNN has reached out to the Russian Ministry of Defense for comment.

Moscow has said that one serviceman is missing as a result of Ukraine’s attack on Sevastopol.