Radioactive Iodine 131 in EuropeWatch
Radioactive particles of Iodine 131 were detected across Europe last month. While the levels were/are not considered dangerous, the situation was enough to warrant the arrival USAF's WC-135C aircraft into RAF Mildenhall; its role is to test the air for chemical, biological, radioactive & nuclear material. The same model of aircraft was deployed after the Chernobyl and Fukushima nuclear incidents.
What caused the spike in Iodine 131 is apparently not yet known - while it's possible the Russians conducted a nuclear test, that doesn't sound like a particularly likely cause as both satellite & seismic detection systems have detected nothing. Apparently, leakage from nuclear reactors has also been ruled out.
The most likely cause according to the second link is a pharmaceutical leak.
This is FAKE NEWS propagated by our enemies, those fascists from the East!
They seek to weaken us, by inducing panic!
Pay it no heed! There is no danger!
There is no radiation. Our peoples are as safe as ever before, under the guidance of our Leaders!
--This is a message from your Ministry of Truth