Odessa, Ukraine - Russia’s Black Sea flagship sank on Thursday after an explosion and fire that Ukraine claimed was a successful missile strike, as the Kremlin accused Kyiv of targeting its citizens in sorties across the border. The Moskva missile cruiser had been leading Russia’s naval effort in the seven-week conflict, in which civilian killings have sparked accusations of genocide from the United States and others. Russia’s defence ministry said the blast on the vessel was the result of exploding ammunition and added that the resulting damage had caused it to “lose its balance” as it was being towed to port. “Given the choppy seas, the vessel sank,” the Russian state news agency TASS quoted the ministry as saying. On the Ukrainian side, Odessa military spokesman Sergey Bratchuk said the ship had been hit by domestic Neptune cruise missiles.