Two frigates, two submarines, aircraft and an anti-ship defense system fired about 50 missiles, according to the Center for Defense Strategies, a Ukrainian think tank. The Admiral Essen, the Admiral Makarov and two Kilo-class submarines were named as the main vessels involved in the attack. The missiles were fired from the Bastion-P mobile defense system, the think tank claimed. Fuel depots in the outer districts were hit VINCENZO CIRCOSTA / ZUMA PRESS WIRE / INSANE / REX CHARACTERISTICS Columns of black smoke darkened the skies over Odessa as the Russian Defense Ministry claimed to have hit an oil refinery and three fuel depots in the suburbs. Ukrainian media reported that Admiral Essen suffered heavy casualties in retaliation, although this could not be confirmed.