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It's worth pointing out that Russia had a lot of trouble getting its latest generation of SLBMs to work properly

https://en.wikipedia.org/wiki/RSM-56_Bulava

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The missile's flight test programme was problematic. Until 2009, there were 6 failures in 13 flight tests and one failure during ground test, blamed mostly on substandard components. After a failure in December 2009, further tests were put on hold and a probe was conducted to find out the reasons for the failures. Testing was resumed on 7 October 2010 with a launch from the Typhoon-class submarine Dmitri Donskoi in the White Sea; the warheads successfully hit their targets at the Kura Test Range in the Russian Far East.[9] Seven launches have been conducted since the probe, all successful. On 28 June 2011, the missile was launched for the first time from its standard carrier, Borei-class submarine Yury Dolgorukiy, and on 27 August 2011 the first full-range (over 9,000 km (5,600 mi)) flight test was conducted. After this successful launch, the start of serial production of Bulava missiles in the same configuration was announced on 28 June 2011. A successful salvo launch on 23 December 2011 concluded the flight test programme. The missile was officially approved for service on 27 December 2011,[10] and was reported to be commissioned aboard Yuri Dolgorukiy on 10 January 2013. The missile did however continue to fail in the summer of 2013 and was not operational as of November 2013.[11] The Bulava became operational aboard Yury Dolgorukiy as of October 2015.[12] However, recent developments put this in question. In November 2015, the submarine Vladimir Monomakh fired two missiles while submerged. One of the missiles self-destructed during the boost phase and the other failed to deliver its warheads to the specified target. After being sent back to the manufacturer, it was determined that the missiles failed due to manufacturing defects.[13]

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And Sarmat is basically 1980s technology. Russia's defence budget is less than the UK's.

So the idea they're going to be fielding nuclear powered cruise missiles and undersea drones with unlimited range anytime soon is pretty remote.

It's all CGI vapourware designed to fool the gullible.

Also US missile defences was never intended to stop a full on attack by Russia or China. Russia doesn't need all this high tech stuff to get through US missile defences it just needs a nuclear trident with submarine, land and air based nukes. Which it has had since the 1960s.

I.e. this is all vapourware and Russia doesn't even need to build it to be sure that it could get through US missile defences.