In brief
On Sunday, Ukraine’s official Air Alert app mistakenly issued warnings of nuclear and chemical danger, sparking widespread sirens across the country. Ukrainian authorities blame Russia for a cyberattack, while the Russian Emergencies Ministry admits a massive cyber incident that spread false information. The false alerts came just days after a truce in Kherson ended, highlighting ongoing cyber‑infodemic warfare in the conflict.
On Sunday, Ukraine’s official Air Alert application unexpectedly issued false warnings of nuclear and chemical threats, triggering civil‑air‑raid sirens across the country and prompting widespread alarm among citizens.
The Ukrainian Air Force’s Telegram channel reported that the app had “appeared to have been subjected to enemy influence” and urged residents to remain calm, stating
There is no radiation threat! Stay calm and follow our updates on our channel.Officials emphasized that the alerts were fabricated.
A post on X by Ukraine’s Centre for Strategic Communications, SPRAVDI, blamed Russian actors for hacking the service. The centre’s message read that the “air alert app appears to have been subjected to enemy influence” and added that the whole affair was a deliberate act by Russia.
Among the erroneous messages the app pushed false claims that a Russian Oreshnik hypersonic missile was on the way and that several Ukrainian regions were under nuclear or chemical attack. Screenshots circulated on social media showed icons marking danger types—including radiation and chemical—overlaying a map of Kyiv.
Kyiv authorities however stated that the separate app dedicated to the Ukrainian capital was functioning normally, and the national emergency service issued an all‑clear at midnight on Monday, declaring the warnings “false” and urging citizens not to spread unverified data.
In a statement on its Telegram channel early on Monday, the Russian Emergencies Ministry acknowledged that its mobile app had fallen victim to a “massive cyberattack” that had “spread false information.” The ministry did not specifically deny the hacking claim but confirmed a systemic IT breach.
Ukrainian officials, mirroring the Air Force’s assessment, described the App as “probably hacked” and cited the false alerts for nuclear, chemical, and street‑fighting threats that set off sirens nationwide. The State Emergency Service warned citizens not to click third‑party links that might amplify misinformation.
These events unfolded against the backdrop of a recently concluded 23‑day ceasefire in Kherson, which had been the longest truce of the war. The ceasefire ended on Sunday as Russian forces resumed attacks on the southern region, tightening pressure on Ukrainian defenses.
The false-air‑alert episode highlights the continuing cyber‑informational dimension of the Ukraine conflict, where both sides reportedly target electronic infrastructure to sway public perception. Moscow has repeated claims of a GPT‑based cyber offensive, while Kyiv stresses its ongoing efforts to safeguard civil‑communication platforms amid frequent missile campaigns targeting energy grids.
