50/50 Either Tallin or St Petersburg. One of them is not in Russia, but both are Russian-style (ie Chernobyl) water pressure reactors. One of them leaked in a massive scale, but thanksfully only twice.
https://foreignpolicy.com/2019/08/12/security-brief-russia-w...
https://en.wikipedia.org/wiki/Leningrad_Nuclear_Power_Plant
Or that military ship Akademik Aleksandrov which was nearby at that time. https://news.ycombinator.com/item?id=23664056
For Russia, my expectations are completely different.