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Ukraine's military on Tuesday announced it had thwarted a Russian missile attack on the capital, Kyiv, shooting down 18 projectiles that were targeting the city. The Russians have stepped up airstrikes in recent weeks in anticipation of Ukraine's much-awaited spring counteroffensive.

But what's special this time is that among the downed volleys were six Kinzhal (dagger) hypersonic missiles, which travel at 10 times the speed of sound and can theoretically escape conventional air defenses. (Military nerds disagree on whether the Kinzhals are actually hypersonic or just have the capacity to go that fast.)