Factbox-Russia fires hypersonic Kinzhal missiles in Ukraine

Smoke rises after a Russian missile strike, amid Russia's attack on Ukraine, in Kyiv, Ukraine March 9, 2023. REUTERS/Vladyslav Sodel

(Reuters) - Russia said on Thursday it had fired hypersonic Kinzhal missiles as part of a massive wave of strikes on Ukraine, in which Kyiv said at least six civilians had been killed.

Here are some key facts on the Kinzhal, which means "dagger" in Russian: