The Russians are in no position to put boots on the ground on the west coast but they can surely roll across Europe.
A generation is considered 20 years. When one considers that 28 years have elapsed since the Wall fell, we have one generation (actually two) that don't remember much, if anything at all, about the cold war in Europe. To them, it's just dusty old history. The under 40 crowd thinks that what happened is old news. Some, like the Millennials, should understand the value of team work (like NATO team work), but I guess this is difficult to grasp outside of one's work environment. Aggression won't happen here. (And if it did, that would be unfair!)
Putin is more of a threat to world peace IMO simply because Russia is closer to the action. He is involved with politics the ME, with no plans to back out. There's oil to be had and he wants some. Russia is not as large as the old USSR, but they are by no means 'bit players' in the scheme of things.
North Americans, for the most part, are blissfully unaware of what is happening on the other side of the world. Some figure that if you ignore Russia, or the ME, the problems associated with immigration, there will be no ill effects. Sadly, many of these people feel the best way to deal with difficulties is to post something on FB, or start an online petition. That makes the problem will go away, don't you know!
That's not even poor planning. That's no planning.