https://techcrunch.com/2018/05/29/yahoo-hacker-sentenced-karim-baratov-fsb/

After pleading guilty in November, the Canadian hacker at least partially to blame for the massive Yahoo hack that exposed up to 3 billion accounts will face five years in prison. According to the Justice Department, the hacker, 23-year-old Karim Baratov, worked under the guidance of two agents from the FSB, Russia’s spy agency, to compromise the accounts.

Those officers, Dmitry Dokuchaev and Igor Sushchin, reside in Russia as does Latvian hacker Alexsey Belan who was also implicated in the Yahoo hack. Given their location, those three are unlikely to face consequences for their involvement, but Baratov’s Canadian citizenship made him vulnerable to prosecution.