Thank you. That memo is not a treaty, ratified by our Senate. Second, Russia clearly broke the agreement. Third it only states that the US is obligated to provide assistance if a threat or act of aggression where nuclear weapons are used. As long as Russia does not use nuclear weapons (or threatens them!), we have no obligation in this agreement.

Also it does not specify assistance. Clearly the US has already assisted Ukraine in defending from the invasion from Russia. And clearly the US people are tired of assisting them. We have no alliance with Ukraine.