Ukraine and Russia say hackers hijacked their emergency alert apps to send fake nuclear warnings

Ukraine's air force said on Telegram that the app had likely been compromised by the enemy and that there was no radiation threat, the BBC and AFP reported. The BBC said one fake message, written in Russian, told users not to worry because an Oreshnik missile was flying. Ukraine's Ministry of Digital Transformation, which supports the app, said it temporarily suspended it, and Ukraine's Center for Strategic Communications blamed Russia, according to AFP and Al Jazeera.

Russia's emergencies ministry said attackers had used its app to spread false information but that the public alert system, which relies mainly on sirens, text messages and broadcasts, was not affected, the BBC and AFP reported. The ministry did not name a suspect, according to AFP and Al Jazeera.

Why it matters: The hacks came as the war's longest truce, limited to Ukraine's Kherson region, ended on Sunday, AFP and Al Jazeera reported. Ukrainian authorities urged people not to click links in suspicious notifications, according to AP and the BBC.