- Emergency alert mobile applications in both Ukraine and Russia were targeted by cyberattacks late on Sunday, triggering false public danger warnings in both countries.
- Residents in Kyiv received fake alerts claiming high nuclear radiation levels, chemical threats, and public disturbances, with messages written in English, Russian, and Ukrainian.
- Ukrainian authorities temporarily suspended the air raid alert app to resolve the breach before restoring it overnight, urging citizens to follow official channels for reliable information.
- Russian media channel Mash reported that the hacking group Hitcore claimed responsibility for the attack on Ukraine's app, though this claim has not been independently verified.
- Russia's Emergency Ministry confirmed its mobile app was also hacked to distribute fake alerts, but reassured the public that municipal sirens, television broadcasts, and SMS alerts remained fully operational.
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