One can wonder what does it takes for the west to military intervene. Sanctions are a long term plan but it won't save Ukraine.
The risks of nuclear war from a NATO militarily intervention are far too high to even consider it. I’m sorry to say, but there is really nothing that could happen in Ukraine that would be bad enough for us to accept the risk of nuclear annihilation.
Once one Nuke is fired it's likely they'll all be because the only real defence against a nation using nuclear weapons against you is to try to wipe them out before they wipe you out.
In this situation hundreds of millions would be likely die directly from the attack and a similar amount would probably die from starvation shortly after as the global economy collapses and crops fail on mass.
There's just no situation that this is something we'd even want to consider. As much as I'd love NATO to be able to intervene it's just not possible. The best we can do is put pressure on Russia and show other nations that this is not acceptable and not in their national interest because of the harsh economic consequences.