Ukrainian President Volodymyr Zelenskyy confirmed in a PBS NewsHour interview that Ukraine had carried out a retaliatory cyberattack on a Russian emergency-alert app. He described it as a response to the hacking of an alert system in Ukraine.
The interviewer noted that the Ukrainian app had sent false warnings about chemical and nuclear threats, while Russian authorities had reported a similar breach of their service. Zelenskyy blamed Russia for the first incident and said Ukraine responded. Neither claim was accompanied by independent technical verification in those reports.