Hours earlier, Ukraine stated it suspected its air raid alert system had been compromised after baseless alerts of a radiation threat appeared on the app designed to warn the public of incoming drone attacks and other threats.
The incidents occurred as a fragile ceasefire in Ukraine's Kherson region expired, raising fears of renewed fighting.
Moscow's emergencies ministry said hackers posted false information on the application. Separately, an official in Odesa reported on Telegram that a Russian attack injured four people.
The incidents came as a fragile ceasefire in Ukraine's Kherson region expired, raising fears of renewed fighting.
Hours earlier, Ukraine said it suspected its air raid alert system had been compromised, after baseless alerts of a radiation threat appeared on the app.
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An official in Odesa separately said on Telegram that a Russian attack injured four people.