Ukraine and Russia say air raid alert apps hit by cyberattacks after truce ends

Ukraine said on Sunday it suspected its air raid alert system had been compromised, after baseless alerts of a radiation threat appeared on the app.

And hours later, Russia also announced its emergency warnings app came under a "massive cyberattack" on Monday, in an apparent exchange of blows as their longest truce came to an end.

Moscow's emergencies ministry said hackers posted "false information" on the app, which is designed to warn the public of incoming drone attacks and other threats.

The cyberattacks came as the longest truce of the war, limited to Ukraine's eastern Kherson region, ended on Sunday after Russia refused the offer of an extension, according to Kyiv.

Moscow did not immediately say who was behind the attack on its app, while Ukraine's Centre for Strategic Communications SPRAVDI blamed the hack it suffered on Russia.

The rare pause in fighting, brokered by US First Lady Melania Trump and which began early Tuesday, had enabled a humanitarian mission to the Russian-occupied city of Oleshky as the war grinds through its fifth year.