On April 20, 2018, the Democratic National Committee sued the Russian government, the Donald Trump 2016 presidential campaign, Julian Assange, Roger Stone, and others over actions taken in the 2016 presidential election campaign. Here is the 66-page complaint, which cites many news sources. The case is filed in Manhattan and is Democratic National Committee v The Russian Federation, s.d., 1:18cv-3501.
The law firm that filed the complaint is Cohen, Milstein, Sellers & Toll. The complaint asks for a jury. Thanks to Political Wire for this news.