US official says conversations with the Ukrainians and Russians are daily and European partners will join Abu Dhabi Ukraine talks; will try to get Russians to agree to a multilateral format

Do believe that need to have Europe at the table. NATO to remain central to European collective defence. Both sides have shown a little flexibility privately on territorial concessions. Proposal is to bring Europeans into the discussion after the trilateral meeting. Territorial issues won't be solved until it is known what the post-war security architecture is going to be. Believes both parties are coming with good intentions. Russia is showing positive signs towards creating an end. Will discuss US security guarantees, want to see security guarantees for Ukraine that are similar to NATO, and want to find a way to make a NATO-Russia council more robust. US envoys may visit Russian President Putin in Russia after Abu Dhabi talks.