Arms depots in Ukraine, because of attacks or simply because of bad storage, have a tendency to detonate.
The Kalinovka explosion on 26/09/2017 is an obvious source for fission products that have been spread through Europe in the few days afterward (Ru 106 but not only, see https://allegedlyapparent.wordpress.com/2017/11/15/oct-2017-ru-103-detections-highest-since-2011-record-high-mdcs-switzerland-radiation-monitoring-stations-czech-republic-i-131-cs-134-measurements-during-ru-106-cloud-compared-to-2011/ on Cs134, Co60, I131…). There has been not only a single blast but a series, confirming arms depot stock continuous wave of blasts. Below is one of the most powerful, where we can as always confirm “microfission” i.e. supercriticity in conventional charges (see https://depleteduranium.org/how-to-make-a-depleted-uranium-atomic-bomb-with-a-few-grams-of-heu-and-a-good-cannon/ ). The flash followed by ascending fireball is obvious.
Link to video. The main issue for surrounding people is whether the weapons stored in the depot included lots of depleted uranium. This would be more likely I think if the weapons detonated include lots of recent weapons made from NATO countries (Russia of course uses “micro-fission” but no information for instance about birth defects increase in Afghanistan in the 1990s). Fission products are of course an issue but far from the radiotoxicity of alpha emitting actinids such as uranium / plutonium (see first acknowledgement of the dangerosity of depleted uranium for human health by the European Commission).
I would recommend to concerned citizens Geiger counter checks (see for instance the Smart Geiger made by Technonia for a first assessment, for more details on the radioisotopes the Rium spectrometer), but for good data on depleted uranium risk, ICP-MS or ICP-AES analysis of a bunch of samples of the ground would be perfect.
On how to deal with cancers, see phytocannabinoids, of course. (article in French with English-language list of links)