The predictions I read cite 300 to 500 warheads if Russia will chose to specifically target Europe, which is unrealistic, as US will (hopefully) retaliate.
It's not me saying that NATO should not attack at all. Having even 300 nuclear warheads shot at you is no good news at all, and you need to preempt that at any cost, including doing a first strike/sabotage on your own.
The number one reason why USSR/Russia never attacked Europe is because it can't attack Europe, and US at the same time. And this is the easiest explanation why Putin been driving a wedge in between EU, and USA for all his 23 years in power.