Fake nuclear threat alerts sent to mobile phones in Ukraine as hackers access emergency alert systems

Authorities in Ukraine and Russia said their emergency alert mobile apps had been targeted by cyberattacks, with users in Ukraine receiving false warnings of an imminent nuclear threat. It was not clear if the attacks late Sunday were related. Ukraine said its service, which residents rely on to seek safety amid daily Russian missile and drone strikes, was up and running again after being suspended due to the attack. Russian authorities said Monday that hackers had sent fake emergency aler...