Official alert apps in Ukraine and Russia sent out false nuclear-threat warnings to millions of users on Sunday, as the two sides stated their systems were compromised.
Ukraine's air attack vigilant app is used by 6.7 myriad people, according to its digital transformation ministry and the app's developer, Ajax Systems.
Ukraine was hit archetypal by the counterfeit alerts, alongside its air attack alert app sending out messages in Ukrainian fair before midnight of a "radiation danger in Kyiv."
A follow-up message, written in Russian, said: "There volition be a nuclear vigilant throughout Ukraine. Don't worry, it's Oreshnik flying."
The Oreshnik is considered one of Russia's most mighty intermediate-range ballistic missiles. It can journey at approximately 10 times the speed of audio and can disperse multiple warheads in clusters. Russia says it is additionally capable of carrying nuclear warheads.
Other false messages warned of chemic threats and "street fights" in Kyiv, according to screenshots seen by Business Insider.
The Ukrainian air force's Telegram channel, which Ukrainians routinely depend on for air attack and drone danger alerts, said afterward stated there was "no radiation threat" and that its app had apt been compromised.
SPRAVDI, Ukraine's center for strategic communications, blamed Russia for the counterfeit messages.
"If you see different messages in the app, disregard," it stated in a article on X.
Unfortunately, Russians have hacked the "Air Alert" app. This is evidenced by the appearance of multiple different alerts. Additionally, there is a communication in Russian concerning "Oreshnik." If you see different messages in the app, disregard. https://t.co/fU7KHmKxs1
— SPRAVDI — Stratcom Centre (@StratcomCentre) November 1, 2026
Hours later, Russia's emergency ministry stated its mobile app had additionally been "subjected to a enormous cyberattack" that sent out false data to the public.
Regional air attack vigilant Telegram channels run by the ministry issued nonsensical warnings in Russian filled alongside vulgarities, according to screenshots seen by Business Insider.
One communication stated "P1-Sun carriers," referring to a small Ukrainian interceptor quadcopter, were sending nuclear warheads to Russia. Another communication urged Russians to stockpile three weeks' value of food at home.
Russia has not officially accused anyone of the cyberattack yet.
Both Ukraine and Russia have waged cyberattack campaigns against all another as the war rages, disrupting community vigilant services or causing them to dispatch false warnings. Kyiv has additionally accused Russia of launching cyberattacks on crucial noncombatant and energy infrastructure.
A akin event in Russia occurred in February 2023, whenever multiple broadcast stations began abruptly broadcasting counterfeit air attack and missile alerts at a period whenever Ukrainian attacks on Moscow were extremely rare.
A week following the archetypal attack, hackers damaged multiple Russian personal broadcast and TV stations to dispatch out audio alerts and display ocular tickers alert of false attacks.
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Matthew is a elder newsman at Business Insider's Singapore bureau. He covers the defence industry, armed forces technology, and evolving strategies in Ukraine, the US, and the Asia-Pacific region.He joined the squad in June 2021, earlier focusing on net infringement and labor, examining how these issues effect contemporary community in Asia, alongside a particular accent on China.Matthew's former activity has been featured in the South China Morning Post, as fine as Singaporean news companies TODAY and The Business Times.