Dealing with mafia gang types is the same in all cultures. They try to convince you they have an asymmetric advantage so you feel fear.
Putin is crazy, he is sick, obsessed with legacy and has nothing to lose bla bla, better be nice to him.
So you deal with them as a state does with any criminal gang.
As for an EMP, have a look at where near all of Russia's population is all up against the rest of Europe.
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90 percent of Russians are a much smaller target than you imagine for an EMP, two of which can catastrophically damage the whole US.
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