Reagan walked away from Reykjavík.
Well, that’s true but that summit was different in that there wasn’t the threat of an expanding war going on at the time. There are lots of countries involved in the conflict in Ukraine (and indirectly through sanctions) so it has the very real potential to spiral out of control. Failure to achieve any results at this meeting could be very consequential.
Trump seems to be tamping down expectations and may be hoping that the meeting serves as a foundation for a turning point in the war. JMHO