Russia’s largest online retailer Wildberries has banned employees from bringing smartphones into its warehouse facilities after workers reportedly recorded Ukrainian drone attacks and air raid alerts, according to the Russian Telegram channel Ostorozhno Novosti.The outlet posted on Monday that Wildberries had sent employees a notice on July 31 warning that photographing or filming air raid alerts and drone activity at warehouse sites could endanger security by revealing the locations of Russian air defense (PVO) positions.JOIN US ON TELEGRAMFollow our coverage of the war on the @Kyivpost_official.“Photo and video recording during air raid alerts threatens security, may reveal the positions of air defense forces, violates Russian legislation, and may result in administrative or, in some cases, criminal liability,” the notice reportedly said.Only button phones allowedWildberries said it had recorded multiple cases of employees filming drones and other incidents at warehouse facilities with their smartphones.To “eliminate such risks,” the company said that beginning Monday, employees would only be allowed to bring button mobile phones without cameras into warehouses.According to the notice, the devices will allow workers to stay in contact with relatives while complying with the company’s new security requirements.The reported restrictions come after a series of Ukrainian drone strikes on Wildberries logistics facilities. Last week, Ukrainian drones struck Wildberries warehouses in Russia’s Penza region and the republic of Udmurtia, causing fires and disrupting logistics operations.