A Ukrainian serviceman stands atop an anti-aircraft-gun tank that has taken part in counteroffensive operations in Kharkiv and Kherson.(Serhiy Morgunov/For The Washington Post)Ukraine's air force claims to have successfully shot down one of Russia's most sophisticated conventional weapons using an U.S.-made Patriot air defense missile, potentially proving that the Kinzhal, or "dagger," hypersonic missile that travels five times faster than the speed of sound is not invincible, as President Vladimir Putin has reportedly asserted.
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