"We are surprised by the prosecution’s continued attempts to classify the case, thereby limiting public access to the details of the legal proceedings," the diplomatic mission said Wednesday.
Earlier, a prosecutor said at a hearing in the case in the US District Court for the District of Columbia that the US prosecutors intend to submit up to 12 terabytes of information on the case of Maria Butina but to seal most evidence.
Butina, 29, is a student from Russia. US authorities charged Butina for acting as an unregistered foreign agent in the United States on July 15. Butina has been denied bail and remains in custody for allegedly being a flight risk. She faces up to 15 years in jail if convicted.