The Kazakhstan-born Canadian citizen Karim Baratov (22) has pleaded guilty to massive 2014 Yahoo data breach that affected three billion accounts. The 22-year-old was arrested in Toronto at his home by the Toronto Police Department in March. In March, the US Justice Department charged two Russian intelligence officers (Dmitry Dokuchaev and Igor Sushchin) from Russias Federal Security Service (FSB) and two hackers for breaking into Yahoo servers in 2014. The man could face up to 87 months in jail for the first charge and 24 months for identity theft charges.”]
Source: http://securityaffairs.co/wordpress/66156/cyber-crime/yahoo-hack-intelligence.html