Ukrainian officials say Russian airstrikes and artillery fire killed six people and destroyed grain storage infrastructure at the Black Sea port of Odesa Monday. The damage further degrades Ukraine’s abilities to export food and fertilizer to world markets, two months after Russia withdrew from a deal that granted safe passage to agricultural exports.

Monday’s attacks came as Ukraine’s military said it had confirmed the deaths of the top commander of Russia’s Black Sea Fleet, along with 33 other officers, in a Ukrainian missile attack on Russian-occupied Crimea last week. But video released by Russia’s Defense Ministry appeared to contradict the claim, showing the commander, Viktor Sokolov, attending a video conference on Tuesday.