Ukrainian forces have destroyed a Russian S-400 missile defense system in annexed Crimea, Kyivsaid Wednesday.The explosion completely destroyed the system, its missiles and personnel, Ukraines GUR military intelligence agency said in a statement, which was accompanied by a video of the blast.Without identifying the weapon that destroyed Russias S-400, the intelligence agency said the explosion occurred on the Tarkhankut Peninsula of western Crimea.Given the limited number of such systems in the enemy's arsenal, this is a painful blow to the occupiers' air defense system, the GUR said.If confirmed, it would be the third Russian S-400 system to be destroyed since the full-scale invasion of Ukraine 18 months ago,according to a tally by the Dutch open-source intelligence project Oryx.Russias military has not commented on the GURs report.The S-400 Triumf surface-to-air system entered service in the Russian army in 2007.