What concerns do Europeans have about the recent US-Russia meeting regarding Ukraine?

Europeans are deeply concerned that the US-Russia meeting, which excluded Ukrainian President Zelensky, mirrors the 1938 Munich Agreement when British and French leaders cut a deal with Hitler over Czechoslovakia. This historical parallel is particularly troubling as that agreement led to Czechoslovakia's disappearance within a year and eventually to World War II. The Russians appear satisfied with the talks, which achieved Putin's goal of dealing directly with the US over Ukraine's head. This dynamic has created significant anxiety among European leaders who fear Ukraine might be sacrificed in a similar manner to how Czechoslovakia was betrayed.