Ukraine's Air Force said Sunday its Air Alert app had been compromised after it reportedly sent false warnings of nuclear and chemical threats in Kyiv and other areas.
The app briefly displayed alerts for nuclear and chemical incidents, as well as warnings of street fighting, according to Reuters. The Air Force said unauthorized persons had interfered with the app's operation and that it had temporarily disabled push notifications.
Two hours later, Russia's Ministry for Emergency Situations said its mobile app had been subject to "a massive cyberattack, allowing attackers to send fake information to the public."
It was not immediately clear if the incidents were linked. CNBC has reached out to Russian and Ukrainian authorities for comment.
The alleged cyberattacks come as Russia and Ukraine continue to trade strikes on each other's territories and infrastructure.