The Budapest memorandum was supposed to protect them but none of the signatories will honour that agreement
Let's be honest here, NATO in terms of defensive power is basically the US, thanks to the stupid wars they've been involved in for the last half century the nation has no appetite for war, this is all purely a political decision to not get involved and actually help Ukraine.
I wonder if Estonia or Latvia or Lithuania are invaded will the reality be that nobody is going to start a nuclear over them as well ?
US & Russia have both shown the world that signed agreements mean nothing, Russia going a step further by giving a nice **** you to the Geneva convention as well
Sadly I still feel this is all Putin's plan, the war itself may not be going as planned but the political side of things is exactly as he planned and we will be sleepwalking into a war we will ultimately have no choice but to enter and by then it could potentially be too late, hell I bet even IF the nukes started to fall, the West would still have their head in the sand pretending it's not happening