Earlier quoted context omitted.
Russia has a bit more than a couple of nukes, as does the US. I believe I've seen the numbers indicate that the present arsenals that are currently in service are too small to erase humanity, but they are definitely big enough to cause hundreds of millions to a few billions of deaths. If we consider the situation of just 1-2 warheads are used in a conflict, I think it really hard to gauge the effect on public percept…
One "solution" is to intercept the nuclear missiles from space. (Reagan's Strategic Defense Initiative). It was restarted a couple years ago with commercial involvement. Possibly a Starlink derivative. Putin must be aware. https://wikipedia.org/wiki/Starlink#Military_capabilities
One of the traditional decoys of an ICBM are basically launching a bunch of decoy mylar balloons with the warhead in one as well. The last round of interceptors couldn't figure out which of the balloons was the actual warhead. Then the government made the results secret.
Worse now is the hypersonic weapons which won't have constant or "ballistic" trajectory. They may be slower in space, but they have maneuverability -- which will allow them to avoid being targeted by the systems the US has.