The key to conquering or defeating Russia has always been Moscow. That’s a critical flaw of the gross centralization practiced in Russia.
In 1945 all phone calls went through Moscow. Obliterating that city would disrupt Soviet command and control.
Erich von Mannstein wrote of this and so did Winston Churchill.
Not going to happen. Russia has the biggest deterrent in form of biggest stock of nukes. And those are not located in Moscow. 12 time zones make USA look small with just 3 time zones.