I don't have more info on the detection of Cs-134, Cs-137 & Ru-103 at a Swedish @ctbto_alerts radionuclide facility than has been reported by news. Levels are higher than normal but don't pose a health risk. Here is the map of probable sources, this is a cause for alert NOT panic
Two nuclear plants in NW Russia, Leningrad (St Petersburg) and Kola (Murmansk), report no issues https://www.ctvnews.ca/sci-tech/radioactivity-hike-seen-in-northern-europe-source-unknown-1.5002755
Radioactivity hike seen in northern Europe; source unknown

Nordic authorities say they detected slightly increased levels of radioactivity in northern Europe this month that Dutch officials said may be from a source in western Russia and may “indicate damage...

https://www.ctvnews.ca/sci-tech/radioactivity-hike-seen-in-northern-europe-source-unknown-1.5002755
At this time there do NOT appear to be other indicators of a nuclear explosive test, such as hydroacoustic, seismic, and/or infrasound data. Nor have I seen reports of a wider number of radionuclides than the original 3 reported. This Daily Star headline is misleading
https://twitter.com/CherylRofer/status/1277052370740899840?s=19
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