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European leaders are far from blameless. I fully agree European countries should have weaned themselves from Russian gas and ramped up military spending much sooner. Meanwhile for a long time the US retained control of NATO military structures in Europe. And recently Trump granted a waiver allowing Hungary to continue importing Russian oil. And there is talk from the US about reviving Nordstream, that both Trump and Biden harshly (and fairly IMO) criticized.

Trump being thin-skinned does not explain much. The latest strategy document where the US administration explicitly says it will do its utmost to bring far-right parties to power in Europe goes far beyond that. It's clearly not just Trump. And again, it definitely does not help keep friends to face China. Neither does twisting Ukraine's arm to accept a disastrous deal in exchange for vague promises of riches for Trump and his clan. History shows appeasing an aggressor invites more aggression. Russia's partner, China, is watching, will sense weakness and draw conclusions neither Europe nor America will like.