Electioneering, posturing, “you are doing this so are we - but first”, etc; yes, but still to be taken seriously.
With improving missile defences then highly manoeuvrable ICBM warheads, stealth, decoys, and jamming would be useful updates; and perhaps not that expensive.
Similarly an alternative nuclear strike capability based on a submarine / air launched long range hypersonic cruise missile could offer a worldwide strike capability, and pose new problems for detection and interception. This system would also provide an alternative second strike capability or give a ‘tactical’ nuclear option which might be required to combat emergent threats.
In addition, a common non-nuclear air/sea hypersonic missile would offer significant flexibility choosing how to deal with a wide range of targets; land, sea, and air (yes air to air), and as a political tool