Russians can still be a problem... North Korea doesn’t have crap and they’re a problem.
My take is Russia is more a problem for ‘the deep state’ than for American citizens. We spend waaaaaaay too much time, energy and money on them. As you say, Mexico has done more harm to America than Russia in the last 30 years... And as far as McCain’s and Graham’s ‘domino theory about Russia taking over other countries? It’s like McCain et al brains are stuck in 1967 Vietnam...
“McCain et al brains are stuck in 1967 Vietnam...”
According to some of his Annapolis Classmates, McCain never had much brain power before the academy, at the academy and after the academy.