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Ukraine's new missile sank the biggest warship in combat since WWII

• The Russian warship, Moskva, was hit by at least one Neptune cruise missiles before it sank, according to a senior U.S. defense official.

• The Neptune is Ukraine's first domestically-made, medium-range cruise missile designed to target warships.

• The Moskva is believed to be the largest warship sunk in combat since World War II.

The Russian Black Fleet flagship, Moskva, that sank on Thursday, was hit by a new type of Ukrainian missile, according to a senior U.S. defense official who briefed reporters on Friday. Russia has maintained the Moskva was damaged in a fire.

The senior U.S. defense official said the ship was hit by at least one Neptune missile and that there are likely casualties — Russian authorities said the crew, believed to be around 500 sailors, was evacuated when a fire broke out and triggered ammunition explosions. The extent of the injuries and deaths is not publicly known.

This would be the first known use of the Neptune missile system and Ukraine's most significant naval strike in the war against Russia.

The Neptune is the first domestically-made medium-range cruise missile for Ukraine, designed to be used against warships, like the Moskva. It is an update of the Soviet-era KH-25 missile — which could only be fired from ships and planes — modified to be fired from truck-mounted launchers at targets on land and sea. It has a range of around 200 miles and is mainly designed to target warships like cruisers and destroyers.

The final tests of the Neptune were carried out in late February, as the war broke out but Ukrainian officials were doubtful of the missile system's readiness, according to a report from the Wall Street Journal. They had originally estimated the Neptunes would be deployed to coastal cities, like Odessa, by April 2022.

Russia has superior naval capability in the Black Sea, and officials hoped the Neptune might level the playing field by raising the cost Russia would pay for shelling Odessa and other vulnerable coastal cities.

(editor：)