Hackers send fake nuclear attack alerts to millions in Russia and Ukraine

Emergency alert services in both Russia and Ukraine were reportedly hit by cyber attacks that sent false warnings of nuclear, chemical and radiation threats to civilians, according to reports on Monday, 2 November 2026.
In Russia
Fake nuclear attack warnings appeared on channels linked to Russia's Emergency Situations Ministry in Moscow, St Petersburg and several other regions at about 2.45am, reportedly telling residents to gather three weeks' supply of food and take shelter in cellars. Similar messages were reported on the ministry's mobile app, by text message and on the state-backed messaging platform MAX. The ministry described it as a massive cyber attack, but said its sirens, loudspeakers, television and radio warning systems had not been affected. It has not been established who carried out the attack.
In Ukraine
Hours earlier, Ukraine's Air Alert service sent a series of false notifications claiming radiation and chemical threats in Kyiv, a nuclear alert across the country and street fighting in the capital, and telling residents to stay indoors. Ukrainian authorities confirmed the service had been hacked and said it was working normally again after midnight. The app normally warns people of incoming Russian missile and drone attacks, often giving them only minutes to find shelter. Hours after the false alerts, real warnings sounded during a Russian attack on Odesa that reportedly injured four people.
Background
The incidents came amid continued strikes by both sides and talk of possible negotiations. A Kremlin adviser said he believed President Vladimir Putin would take a phone call from President Volodymyr Zelensky, although Putin has refused his calls in the past.
Why it matters
Experts warn that attacks on alert systems are dangerous because they can cause panic and make people less likely to trust genuine warnings.
- False alerts warned of nuclear, chemical and radiation threats.
- Russia called it a massive cyber attack.
- Both countries said their systems were restored.


