Which missile are your referring that is nuclear powered moving at hypersonic speed? Six new strategic weapons were announced a year ago. Two were nuclear powered.
9M730 Burevestnik is a cruise missile that has virtually 'unlimited'. It has limits but it can travel around the world many times. :
9M730 Burevestnik - Wikipedia
Poseidon torpedo also has 'unlimited' range. It's designed to devestate navy bases, aircraft carriers, submarines. Any object in water. It's the largest torpedo ever designed. :
Status-6 Oceanic Multipurpose System - Wikipedia
Neither weapon travels at hypesonic speed. I doubt it is possible to travel in water at hypersonic speed.
Russia has two hypersonic missiles
Kh-47M2 Kinzhal missile that can carry nuclear warheads fitted on planes. Its range is 2000-3000km only. Therefore, it is not nuclear powered.
Kh-47M2 Kinzhal - Wikipedia
And Avangard (hypersonic glide vehicle) weighing 50 tons that is released in space by ICBM .
Avangard (hypersonic glide vehicle) - Wikipedia
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When approaching a target, the glider is capable of sharp high speed horizontal and vertical evasive maneuvers in flight, making it "absolutely invulnerable for any missile defence system," according to Russian officials. According to Russian President Putin, Avangard strikes "like a meteorite, like a fireball". The blast yield of a nuclear warhead carried by the Avangard is reportedly more than 2 megatons TNT. The Avangard has been demonstrated to operate at up to Mach 27 during the latest flight test.
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Neither hypersonic weapon is nuclear powered.
Russia is developing 3M22 Zircon hypersonic cruise missile that will be used in Navy ie fitted on war-ships. Its range is 1,000km. So not nuclear powered. :
3M22 Zircon - Wikipedia
In summary, six strategic weapons were announced that are in Russian military. Two were hypersonic not nuclear powered. Two were nuclear powered that can travel around the world but not at hypersonic speed. The remaining two
a newly built RS-28 Sarmata very sophisticated heavy (220 tons) ballistic with some maneuverability able to carry a heavy load - both nuclear and non-nuclear warheads. It can reach western hemisphere flying over southern pole. And hit any target on the planet within 30 minutes with precision given GPS (Russia uses its GLONAS) .
RS-28 Sarmat - Wikipedia
The last one was a laser weapon Peresvet. Russians don't reveal how they are going to use the weapon. It remains to be a secret. :
Peresvet (laser weapon) - Wikipedia