Edit: but bravado aside, I think no, it would not. I think Russia would just back down. If they were willing to escalate, I think we would have seen a nuke in kyiv by now
Edit edit: and it is worth it to show we are willing to stand up for such things. We cannot afford to roll over to anyone with nukes
If you're brave enough, the Ukrainian military is accepting volunteers. Other foreigners have already enlisted. Go join them. And I'm not being snarky: if you really believe in the cause then I sincerely think you should do something about it.
There's a line you cannot cross, and wasn't crossed in the entire cold war as bitter as things got-- and that is NATO troops on Russian soil or vice versa.
I understand the risks
You must be young. The same reason for going to war were used back for Iraq (both of them).
And as an aside, my personal view is peak nuclear escalation risk is in another 3 or 4 weeks when Russian forces in the east and south hit a similar point of exhaustion/forced withdrawal that we just witnessed in the north. I don't think Putin is going to react well once the news finally penetrates that his miscalculation has destroyed his army and revealed him and the Russian state to be laughingstocks.
I am strongly in favor of military intervention.
I know I’m being an antagonistic asshole, but I would genuinely be curious to know what precise benefit you think nato intervention would achieve and why you value that benefit so highly as to incur near incalculable risk. I’m assuming you haven’t done that analysis, but then I’m an asshole who may be selling you short.