"The court appoints A.J. Kramer as advisory counsel to Defendant Maria Butina," the filing said without providing additional details.
On Thursday, US District Court Judge Tanya Chutkan held a telephone conference with Butina’s lawyers, who requested that parts of the conversation be closed to the public in the courtroom.
"By December 10, 2018 at 5:00 pm the defendant shall show cause in writing why the court should not unseal the sealed portion of the transcript of the telephone conference held on December 6, 2018," Chutkan said in the court filing.
The US authorities arrested Butina in mid-July on suspicion of acting as an agent for a foreign government without being registered. Butina, a student and political activist, has denied the accusations.
If convicted, however, she faces a prison sentence of up to 15 years.
The Russian authorities have criticized the US government for arresting Butina, insisting that the charges against her were groundless. The Russian Foreign Ministry has said the charges against Butina were trumped-up and called her ongoing detention unacceptable.