Ukrainian authorities open an investigation into hacks by APT 28 (a.k.a. “Fancy Bear”), affiliated with the Russian GRU, into Ukrainian energy company Burisma. Burisma, with which former U.S. Vice-President Joe Biden’s son Hunter Biden was once affiliated, has been the subject of political questions in the United States in the 2020 Democratic presidential primary. APT 28 has a history of using cyber operations to interfere in U.S. elections, having hacked the U.S. Democratic National Committee (DNC)’s servers in 2016.