A cyberattack on Russian airline Aeroflot has caused a major outage, leading to over 100 flight cancellations and delays.

Russian airline Aeroflot was forced to cancel more than 50 round-trip flights on Monday, disrupting travel across the world's biggest country, as two pro-Ukraine hacking groups claimed to have inflicted a crippling cyberattack.

Two pro-Ukraine hacking groups claimed to have carried out a year-long operation to penetrate Aeroflot's network