Mao said he hoped that the US would do a nuclear strike on China because he believed they would win a nuclear war.
China to this day plans to win a nuclear war, as does Russia.
China builds ghost cities all over the country and Russia builds bunkers and underground cities all over the country.
The US is doing on the other hand ... nothing. They will loose by default.
If they have no good choice left they will do a first surprise first strike on the US and just accept the cost of the limited response.
Hypersonic weapons are crucial to do this successfully because they can't be tracked by any modern technology because of their speed, their size and the plasma surrounding the object during flight.
I believe inevitably this is going to happen, the US will go too far or miscalculate and Russia/China are going to start to do a coordinated surprise first strike on all relevant military installations of Western powers, after that they will offer these governments to give up unconditionally or try to retaliate and loose their whole population.