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> Russian hypersonic missiles

There are zero such missiles. It's all marketing BS. They have air launched ballistic missiles. These are not "hypersonic missiles" by any accepted definition.

(If the Russian definition is valid, then the V2 was a "hypersonic missile").

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In fact hypersonic missiles are pretty common. Every rocket that leaves Earth’s orbit is ‘hypersonic’. There is nothing inherently special about being ‘hypersonic’ in general. In space everything achieves hypersonic speed quite easily(ICBM’s and space rockets) are all hypersonic when they enter space. The trick of hypersonic missiles is to do that within the constraints of earth’s atmosphere. The US has them:

https://www.raytheonmissilesanddefense.com/what-we-do/hypers...

https://www.lockheedmartin.com/en-us/capabilities/hypersonic...

and apparently the Chinese:

https://theconversation.com/chinas-hypersonic-missiles-threa...

It's unclear whether they have any in operational service right now, but the Zircon is certainly a true hypersonic maneuvering cruise missile, rather than merely a ballistic missile or even glide vehicle.

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