Even Poland only started rearming after Kazynski's plane was shot down in Smolensk in 2010, Romania only started after Crimea and it's implications of a similar incident in neighboring Moldova in 2014, and Turkiye began due interventions in Syria and Libya that lead to Turkish and Russian soldiers fighting against each other in 2012-15.

Trump is absolutely wrong in publicly abandoning our European allies, but this is something every administration since 2008 has been saying would eventually happen.

The failed UK-France intervention in Libya should have been the warning call (France and UK's air forces couldn't disable Libya's A2AD and ran out of precision muntions, forcing the Obama admin to intervene and spark the Benghazi crisis which helped bring Trump into the Oval Office in 2016). In fact, that incident probably further emboldened Russia as Libya's military apparatus was heavily Russian/Soviet in armament and strategy.