A Canadian man accused in a massive hack of Yahoo emails posed an "extremely high flight risk" in part due to his alleged ties to Russian intelligence agents, law enforcement officials allege in documents filed with an Ontario court.

A friend of 22-year-old Karim Baratov is showing her support for the Canadian-Kazakh national at the centre of a U.S. investigation into a massive cyberattack against Yahoo in 2014, saying the young man she knew was kind, genuine and always there to lend a helping hand.

Karim Baratov, a 22-year-old Canadian-Kazakh national charged in a U.S. investigation into a massive cyberattack against Yahoo in 2014, was known for driving luxury cars and throwing lavish parties at his Ancaster, Ont. home, according to neighbours and social media profiles.