Upon a cease fire what should USA / NATO / EU follow up be?

Upon a cease fire what should USA / NATO / EU follow up be?
Ukraine fast tracked into NATO but NOT EU
Ukraine fast tracked into EU but NOT NATO
Ukraine host willing NATO nations troops AND EU invite
Ukraine host willing NATO troops & NO EU invite
Ukraine fast tracked into BOTH EU & NATO
Ukraine host EU troops & handle EU invite if any
Upon ceasefire USA walk away. Mission accomplished!
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Upon a cease fire what should USA / NATO / EU follow up be?
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