The summits are not endpoints. They are the mechanism by which two countries, which can neither resolve their differences nor afford to rupture them, manage the interval between crises.
With his reliance on naked power and rejection of all constraints on his authority, Trump represents the opposite of everything that made the U.S. great.
If boat trips from a few hundred years ago are not a claim of ownership, then why should this just apply for Denmark in Greenland, and not also for the European colonizers in North America?