Yeah, the person above isn't being accurate at all.

While here in the UK we rely heavily on the US for control of Trident, the US dropping NATO support would just require additional defence spending and closer alignment with Europe. If Trump is bought by Russia, Putin would see this as a Very Bad Thing, and would want to keep the US in the fold because even with the US NATO would likely steamroll Russia.

The Trump dynamic is somewhat problematic, should it fester elsewhere in Europe. Globalisation was an important trait to maintain for the US, whereas most populist movements move towards buying local or supporting national interests above all else. Europe is largely self-sufficient, even in defence, so Trump would probably cut off huge numbers of imports/exports just to prop up Elon's shitty cars.