Ukrainian defense sources say devices hidden inside heated shoe insoles were sent to Russian military units earlier this month as part of a covert operation, according to the defense website Militarnyi . Each insole contained 10–15 grams of explosives. Deliveries involved “tens of thousands” of items, Militarnyi said, with devices moved through Poland and Belarus using Russian “volunteers” and charity groups. JOIN US ON TELEGRAM Follow our coverage of the war on the @Kyivpost_official . A