There is 2 kinds of threats in the world if you live in the west and thats Russia/China and Terrorists. I wouldn't even consider NK to be a threat at all just a backward country that is more likely to blow themselves up with there own nukes than to actually be able to aim one at its enemies!
But we cant go to war with Russia/China cause it would cause Nuclear annihilation and the end of the human race and the other threat is just goat herders with AK-47s and explosives.
My point is why does Germany need to build up militarily? Russia knows they cant go steamrollering into the Fulda gap anymore like its the 1980s and we know we cant risk all out nuclear war because even 1 city destroyed by a nuclear attack is a price too much to pay.
We live in constant stalemate with our enemies