Nuclear radiation in Russia, Ukraine? No, just hacked warning alerts

What the report says

Ukraine and Russia each accused the other of interfering with emergency alert systems after false radiation and attack warnings briefly reached civilians this week, according to Al Jazeera. The hacked notifications appeared on Ukraine’s Air Alert app late Sunday and on Russia’s civil defence warnings app on Monday, prompting official clarifications and public reassurance. Al Jazeera reported that the misleading alerts caused concern in and around Kyiv and were cleared up within about an hour in Ukraine.

In Ukraine, authorities said the app wrongly warned of nuclear and chemical threats, possible street fighting and the use of Russia’s Oreshnik missile. Officials said there was no radiation danger and told people to remain calm. Ukraine’s cyber officials blamed Russia, while Moscow later said its own system had been hit by a large cyberattack that spread false information and incorrectly warned of drone strikes.

The episode came as a local ceasefire in Russia-occupied parts of Kherson ended, and it highlighted the growing role of cyber operations in the war. Al Jazeera noted that both countries have long used hacking and online disruption against each other’s infrastructure. The report also underscored why radiation warnings are especially sensitive in Ukraine, given the legacy of Chornobyl and the continued risks around the Russian-controlled Zaporizhzhia nuclear plant.