It's clear that while Trump is in the White House, the USA will not be an ally of democratic Europe, and is indeed an adversary.

Despite the desperate thinking of some, this applies equally to the UK, and the only valid response is to commit fully to Europe.

https://www.theguardian.com/us-news/2025/mar/07/trump-says-it-is-easier-to-deal-with-russia-and-putin-wants-to-end-the-war