Rival Russian and Ukrainian hackers have claimed credit for a cyber-attack that led to fake nuclear war alerts being issued in both countries.
The bogus alarms went to millions of people across Russia and Ukraine in an apparent tit-for-tat exchange by two groups.
The first warning came just after 11pm on Sunday when Ukraine’s air raid app, which is used by some 6.7 million people a day, was struck.
One of the fake alarms said Russia had launched a hypersonic Oreshnik missile, which is capable of carrying a nuclear warhead. The weapons can travel more than 7,000mph and have previously been used by the
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