WATCH: Zelenskyy confirms Ukraine hacked back after Russia's cyberattack of its emergency alert system

According to the Kyiv Independent, Ukraine's Air Alert app, which provides vital updates to citizens about incoming Russian strikes, was hacked late on Nov. 1. False warnings of nuclear, chemical, and street-fighting threats were sent out to the app's users across the nation.[2]NBC News reports that Ukraine's air force said the app had most likely been "compromised by the enemy,"[3] and confirmed that there was no "radiation threat."Kyiv Post reports that Russia's Emergency Situations Ministry subsequently reported a similar cyberattack on its own mobile application.[4] According to the outlet, Russian users received false notifications claiming nuclear warheads had been launched toward regions across the country.[4]"I underlined it several times that we only respond to their attacks," Zelensky told PBS NewsHour[2], according to the Kyiv Independent. Kyiv Post reports that when asked whether Ukraine had responded by hacking Russia's emergency mobile application, Zelensky confirmed the retaliation.[4]Zelensky told PBS that the attack was "one of the hundreds and thousands of those made by Russians before on banking systems, on pensions, social support[2]," according to the Kyiv Independent.According to the Kyiv Independent, Kremlin spokesperson Dmitry Peskov said that Russian government agencies' electronic resources are under constant threat of cyberattacks.[5]NBC News reports that the hacks came just as a rare humanitarian ceasefire between the two sides ended[3].