https://english.kyodonews.net/news/2024/04/5b04075ff3c8-increased-activity-at-nuclear-test-site-in-northern-russia-expert.html Active construction has been seen at a nuclear test site in northern Russia since last year, raising the possibility that Moscow is preparing for a fresh nuclear test, a Japanese expert on the Russian military said Monday. Citing analysis of satellite images, Yu Koizumi, associate professor at the University of Tokyo, said a large-scale…