US, China, Russia, and the EU: this is too big to be done in a reasonable time frame by just one of us, so even though one half of us hates the other half, let’s cooperate.
UK: hold my beer, YOLO, #WeThinkItsStill1850
JET = Joint European Torus
It was a coalition of all EU countries. Switzerland (non EU) joined later and UK quit the coalition with Brexit but continued to see this project through.
Their decision to break with the coalition is stupid, but I don’t see any reason why they can’t exchange knowledge in the future too.
The JET was basically a result of European scientists being invited to USSR to verify their results. The world of science is often a lot more open than the political that way.
UK also dropped out of ITER - it’s mentioned in the article.
