MOSCOW (Reuters) -Russian airline Aeroflot cancelled dozens more flights on Tuesday but said it had now stabilised its schedule after a major cyberattack a day earlier. Two pro-Ukraine hacking groups claimed on Monday to have carried out a year-long operation to penetrate Aeroflot's network.

Aeroflot, Russia's flag carrier, has suffered a cyberattack that resulted in the cancellation of more than 60 flights and severe delays on additional flights.

A cyberattack on Russian state-owned flagship carrier Aeroflot caused a mass outage to the company's computer systems on Monday, Russia’s prosecutor’s office said, forcing the airline to cancel more than 100 flights and delay others.