"Within 21 days after service of this summons on you (not counting the day you received it) — or 60 days if you are the United States or a United States agency, or an officer or employee of the United States… you must serve on the plaintiff an answer to the attached complaint," the documents said.
The summons were issued to President Donald Trump's campaign headquarters, Russian businessmen Araz Agalarov and Emin Agalarov, WikiLeaks founder Julian Assange, and the main intelligence directorate of the General Staff of the Russian Armed Forces (referred to as "GRU" in the court documents) and Trump's son-in-law and adviser Jared Kushner, among others.
READ MORE: Russian Senate Records External Attempts to Meddle in Presidential Election
Several investigations into the alleged interference in the 2016 US presidential vote that saw the victory of Republican candidate Donald Trump have been ongoing.
Moscow has repeatedly denied interfering in the US election, characterizing the allegations as absurd and intended to deflect public attention from actual instances of election fraud and corruption, as well as other pressing issues.