I hate how “anti-war” has been hijacked by these people to mean, let imperialist countries invade whoever they want with no consequences. (in the case of tankies, any imperialist country that isn’t in NATO).
Similarly if most countries have a mutual defence pact, no one country will be able to invade another without being at war with literally the whole world.
I’m afraid that mutual defense isn’t as iron clad as you think. If Article 5 of NATO ever gets triggered you’ll get a masterclass on weaseling out of obligations. It’s ironic because Ukraine may already be receiving the kind of support a full NATO member is entitled to.
Unfortunately with Trump the US will try to weasel their way out. Europe knows too well what happens.
It only works if you actually commit to it.
But imagine the implications if a country did not commit to it (bar an obvious one like Hungary or Turkey). They’ll likely get sanctioned, probably will have trouble entering any useful alliances for the next decade or so because no one trusts them anymore.
If one didn’t, sure. But what happens when NATO as a whole doesn’t defend Poland? What’s Poland going to do? Or even just Trump’s US?