Yes, you did forget a scenario where a EU, US and possibly other countries military presence is on the table as a threat to deter further escalations by Russia,

Yes, you did forget a scenario where a EU, US and possibly other countries military presence is on the table as a threat to deter further escalations by Russia, but does not actually occur. To be more specific, you give Ukraine what it needs to freeze the current lines, a cease fire is signed, Russia gets to stop fighting while saving face, and the unoccupied part of Ukraine gets what would amount to NATO membership without formally joining . The status of the occupied territories remains ambiguous, with the West and Ukraine banking on a change in leadership in Russia at some point in the future. As far as I can tell, this is the type of deal that Zelensky thought he came to DC for.