Volodymyr Zelenskyy confirmed to PBS News that Ukraine hacked Russia's emergency alert system in response to Russia's cyberattack on Ukraine's alert system

An ongoing armed conflict between Russia and Ukraine that was sparked with Russia's annexation of Crimea in 2014 and escalated into a full-scale invasion in February 2022, resulting in widespread casualties, displacement and significant geopolitical consequences for Europe and the world.

Compromised Ukrainian and Russian emergency applications distributed false public warnings on 1–2 November. Ukraine's app displayed fabricated nuclear, chemical and missile alerts, while Russia reported false information through its emergencies application. Other Ukrainian warning channels remained operational. No evidence has established a common perpetrator or coordinated operation.