Sweet Mary gives a pretty good primer. Wish there were better news; looks like Xi/Putin are indeed a team against Trump, IDK.
The absolutely great video I posted here with a tour of the 3 bases discovered and reported to US authorities has been deleted. Here’s a shorter version that will show you some of it. I really wish I had that original video, as the bases that were built are jaw-dropping!
If you’re also interested in UFOs/technology, you can search Lee’s channels for all sorts of videos.