He told Germany and other NATO leaders that dependence on Russian oil was a major threat to their economies. He told them they should focus on other avenues. But they didn't listen. He was tough on Russia.
He wasn't advising Germany to divest from Russia because it would strengthen NATO. He was saying NATO was corrupted because of Russian oil and therefore was worthless. This is based on the same fallacious perspective that Putin employs. Namely that NATO exists to be Russia's adversary. NATO exists for the defense of politically-aligned democracies against aggressors. Russia is only the enemy of NATO because they choose to be. Trump's behavior towards Ukraine was not only grotesquely unethical and breach of his Constitutional obligations but seriously weakened their position when it came to resisting Russia.
Based on all his public statements and all the insider accounts from both career civil servants and even his own political appointees, Trump never bothered to understand the subtlety of NATO or really any other policy. Just read what Fiona Hill and John Bolton among others have to say. He wanted out of NATO. He respected the word of Putin, he hated Ukraine and it was 100% personal. He refused to press Putin on election interference when he met him in Finland, but withheld Congressionally appropriated aid to Ukraine unless they did him a favor to help his own electoral fortunes.
The 2% defense spending target was negotiated by Obama and agreed by NATO members before Trump took office. Trump took that cue and railed that America was paying for NATO as though it were a dues-based organization. When he went to Brussels to push for compliance, he raised the prospect of 4% as a new spending target even when the US was tracking to drop below 3%. While he may have achieved a policy victory here and there it was only ever by coincidence. I've not seen any indication has understands or even cares about any policy whatsoever and only says things that get him attention.
He told Germany and other NATO leaders that dependence on Russian oil was a major threat to their economies. He told them they should focus on other avenues. But they didn't listen. He was tough on Russia.