Trump's anti NATO moves started after he was flown by the KGB to Moscow in 1987 https://www.politico.com/magazine/story/2017/11/19/trump-fir...

after which he took out a full page ad and went on TV slagging NATO https://youtu.be/NSvdMiV33Ik

It may not be US's long term strategy but could be Russia's. A pawn in their 3d chess maybe?