Russian military hackers late last year infiltrated Burisma Holdings, the Ukrainian energy company where Hunter Biden, Joe Biden's son, was previously a board member, according to a report from cybersecurity firm Area 1. The operation began in early November, as a congressional impeachment inquiry into President Donald Trump was underway.
https://www.cbsnews.com/news/hunter-biden-trump-burisma-holdings-russians-hacked-ukrainian-firm-with-hunter-biden-ties-2020-01-13/U.S. intelligence officials concluded that Russian hackers linked to GRU were responsible for hacking the email servers of the Democratic National Committee during the 2016 election. The emails were eventually disseminated through DCLeaks and WikiLeaks and amplified by a network of bot accounts on social media.