just one thing to remember though:

Russia can activate the DEADHAND Perimeter system (my username, before I changed it to #darknostr) and it can be utilized even when the possessors of the nuclear codes, like Mr. Putin's failing health considering, or any other of the 3 who can make the decision to activate the codes are no longer around or alive. Maybe the US wants to see the Deadhand nuclear codes become active and when it does, all hell breaks lose as it's reach is far wider than the atomic bomb