Ukraine's Air Alert app probably hacked, showing false nuclear alerts on 1 November

What the app displayed

On the evening of 1 November, the Ukrainian Air Force said the Air Alert app had probably been exposed to hostile interference and could be giving wrong information. The Air Force posted its warning on Telegram and asked the public to remain calm. Aktuálně.cz reported that the app's notifications showed nuclear and chemical hazards and warned of street fighting in Kyiv. Newsorf reported that a nuclear alarm appeared briefly for Kyiv and other areas before disappearing. Around 22:30 Central European time, the app was still showing a red danger level in all Ukrainian regions, according to Aktuálně.cz, which also said a message in Russian had appeared in the app announcing a nuclear alarm across Ukraine.

Official responses

The Air Force stated that there was no radiation threat and advised residents to follow official messages. The Ukrainian Center for Countering Disinformation said the threat levels shown in the app did not match reality, according to Le Soir. The Air Force said the radiation hazard signal had been played on loudspeakers in the Lviv region, and that it was not a real threat. The app, which the Ministry of Digital Transformation of Ukraine supports, sends instant alerts when air defence alerts begin and end. Natalya Zabolotna, governor of Vinnytsia oblast, said the app had been hit by a cyberattack and warned people not to click a link in a message. The Air Force advised residents to switch on phone notifications, pay attention to sirens and read only official sources.

Timing and the truce

Le Monde and Le Soir both tied the warning to the end of a localised humanitarian truce. Le Monde said the Air Force statement came a few minutes after the truce ended, while Le Soir put it a few hours after the truce, which had been arranged around Oleshky. The two reports therefore differ on the gap, and neither gives a clear time for when the truce ended. Both outlets date the statement to the Sunday evening, which places it on 1 November.

Earlier faults

Aktuálně.cz placed the incident in a pattern of faulty alerts. In August 2025, residents of Poltava oblast received a radiation warning during a Russian drone attack, and authorities then said it was a technical fault in the warning system. On 26 October 2026, the app repeatedly sent false air alert notifications in Kyiv. The outlet did not describe any official explanation for the 2026 Kyiv notifications.

Who is blamed

The Aktuálně.cz headline attributed the hack to Russians, but the Air Force's own statement only spoke of hostile influence without naming a country. Le Soir cited the Ukrainian Center for Countering Disinformation as saying the app had probably been hacked. Governor Zabolotna was the only named official in the reports to attribute the incident to a cyberattack. Aktuálně.cz said it was not yet clear who was behind the incident or how the system had been breached.