The charts above are from a study of citizens in Europe by the European Council on Foreign Relations. Basically, they asked those citizens who they trusted to defend them in their own country. A few years ago, the United States would have been trusted the most by the bilk of Europeans, but that is no longer true.
The top chart shows that very few would pick the U.S. now over the European Union. Only between 3% and 19% would trust the U.S., while between 25% and 60% would trust the E.U. more.
The charts below that are even more troubling. One asks whose side their country should take in a conflict with Russia, and the other asks the same of a conflict with China. In both instances, the overwhelming majority says their country should side with neither.
Europeans don't trust the United States under Trump to back them in a conflict, so they see no reason why their country should back the U.S. That's scary, because it shows that Trump, in just a couple of years, has destroyed the trust Europeans had in this country.