A lot of extreme comments here, US presidents come and go, it is in their interest to have a strong stable Europe, the UK “IS” part of that. There is no movement for the US to leave NATO, they need us, as much as we need them, what they don’t like is Europe not paying their share of defence, we are in the front line but dependant on US technology. The US wants to reduce its commitment to Europe so that it can concentrate on Pacific and Middle East problems.
The threat from Russia has been greatly overstated, they were very poorly prepared for the Ukraine war and are still playing catch up, NATO has far greater capability. Ukraine wanting to join NATO destabilized the status quo and pushed Russia closer to China and Iran, a seriously dangerous alliance in my opinion
As for the UK, make no mistake any changes to our relationship will be by EU rules, 27 nations are not going to change anything just to please the UK, there is no point bemoaning Brexit we made our bed however uncomfortable that is.
It’s true repeat lies often enough and they will be believed that has been repeated countless times over history, to manipulate the population. Hopefully Trump will end the Ukraine war, that will probably be the only favour he will do for Europe, if it drags on it could become very difficult.