And we should just assume all countries will comply. If they don't comply, what would you do; ask them nicely to stop? If they ignore you, would you ask them sternly to stop?
And herein we learn why pacifism just doesn't work. It's a classic case of mistaking the ends for the means. It makes the false assumption that reason the violent regimes of the world haven't stopped being violent is because the idea just never occurred to them and they will do so the instant someone else gives them a good example.
Bob: Well I think it would be a better world if everyone renounced violence.
Ted: Of course it would be, that's almost self evident. But that doesn't answer the question of how we achieve such a world.
Bob: Well everyone just should!
Ted: Okay and what about those individuals and groups that choose not to do so? By defining force to stop force as bad, you leave no recourse. So how would a pacifistic nation deal with an aggressive one? How would they make the other country stop being aggressive?
Bob: Errr..... well... errr... Well they just should!
Ted: Right, I get that, I agree but how do we effect that change?
Bob: Errr...
It's self defeating to define fighting to make the world a better place, be "fighting" either literally physical fighting or intellectually, because it assures those that don't follow your rules will win.