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I haven't watched nor read anything else about this so I don't have a full understanding of the meeting.
Having said that, I don't what anyone would expect a world leader to do. He either fights off an invasion without help or sells his nation off. This is a lose lose situation. The USA is losing its image of a country that supports cooperation to an economic invader picking on someone while their down.
And it’s going to take a long time to get any positive view about the US from anywhere, including the citizens. Any country where every four years you can just completely about face any contract, agreement, accord, convention, treaty, whatever, who would want to deal with that country? You could sign something, be perfect partners and then 4 years later get tariffed and humiliated on a whim just because a of a small percentage of votes (or lack of votes).