Stay calm and follow our updates on our channel.”SPRAVDI, Ukraine’s Centre for Strategic Communications, blamed Russia for the hack in a post on X.The raid alert app is used across Ukraine to warn people in real time of incoming Russian air attacks. A separate app, specifically for the Ukrainian capital, was working normally, according to Kyiv authorities.Hours later, early on Monday morning, Russia’s Emergencies Ministry said its mobile app had been hit by a “massive cyberattack”.The ministry said on Telegram that the attack led to the spread of “false information”.Russia’s and Ukraine’s announcements follow the end of a truce between the two countries in Kherson.The localised ceasefire, which began on Tuesday and ended on Sunday, was the longest of the war so far.