Russia's Kinzhal was never an unstoppable hypersonic missile, but the Patriot shot that killed one is still 'impressive,' expert says

• Ukraine shot down a Russian Kinzhal missile described as a hypersonic weapon with a US-made Patriot interceptor.
• Russia has said the weapon is unstoppable, but it was never quite what Russia claimed.
• Still, a missile defense expert told Insider the missile is tough target, making it an "impressive" kill.

The Ukrainians recently did what the Kremlin said was impossible and shot down an advanced Russian Kinzhal missile, according to the US and Ukrainian militaries.