Two Russian warships were damaged after Ukraine launched an extensive assault on a Russian ship repair base in Crimea early Wednesday morning, officials said, in what appears to be Kyiv’s most ambitious strike on the port since the war began.

Russia’s Defense Ministry said Ukrainian armed forces attacked the Sergo Ordzhonikidze shipyard in Sevastopol, which Russia uses as a repair base for its Black Sea Fleet, with 10 cruise missiles and three unmanned boats.

The ministry said its air defense forces shot down seven of the missiles and that the patrol ship Vasily Bykov destroyed all of the boats.

But Russian officials confirmed that the attack had damaged two Russian warships and left 24 people injured.