Russian and Ukrainian hackers hijack emergency apps to spread fake nuclear attack warnings

A Ukrainian air raid alert system was compromised, leading to a retaliatory hack of a similar Russian system by a cyber group. The initial breach of the Ukrainian system was used to spread fake warnings of a nuclear attack. The hacking of these emergency apps has resulted in a cross-border cyber incident between Russia and Ukraine. The incident involved the dissemination of false information, potentially causing alarm among the public. The cyber group responsible for the Russian system hack acted in response to the initial Ukrainian system breach. The hacks have highlighted the vulnerability of emergency alert systems to cyber attacks.