1. Nuke doesn't guarantee anything in current situation. Russia might blow up the nuke moment it arrives in Ukr.
2. US France UK has made it very clear that they can occupy and establish military bases in non nuclear countries without repercussions, especially in Middle East and Africa.
3. Memorandum was signed by multiple nuclear countries and none of thier troops are deployed in Ukraine. Besides US was the largest supplier of weapons in Ukraine.
US is hardly affected by Ukr situation. For them to get involved, there should be something at stake. If they owned something in Ukr, they would have reason to defend it with US troops. Russia won't escalate by attacking US troops or resources.
2. US France UK has made it very clear that they can occupy and establish military bases in non nuclear countries without repercussions, especially in Middle East and Africa.
3. Memorandum was signed by multiple nuclear countries and none of thier troops are deployed in Ukraine. Besides US was the largest supplier of weapons in Ukraine.
US is hardly affected by Ukr situation. For them to get involved, there should be something at stake. If they owned something in Ukr, they would have reason to defend it with US troops. Russia won't escalate by attacking US troops or resources.