So they know where the emission originated from, but they are not telling it?? Please. Are we still in the 80ies?
Spoiler: 99% chance it's from Russia.
Russia is definitely a high risk area (if not THE high risk area), considering their soviet legacy of ancient nuclear power plants etc.
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.