Trump's threats to exit NATO have caused Europeans to bulk up their own militaries for a worst-case scenario of no US help https://www.bbc.com/news/articles/ceqjd11l55wo
Poland and the Baltic states (Latvia/Lithuania/Estonia) are also looking at withdrawing from an anti-land-mine treaty and mining their borders with Russia. https://www.bbc.com/news/articles/cjryp19884yo