This was reported to RIA Novosti at the Russian embassy in Washington.
“We will provide him with the necessary consular and legal assistance,” said the representative of the embassy.
In addition, the interlocutor of the agency, referring to information from the US authorities, said that Vinnik was being held in the Santa Rita prison in California.
The trial of the Russian takes place in San Francisco.
Earlier, Vinnik pleaded not guilty during a court hearing for the Northern District of California.
On August 5, the United States authorities notified Russian diplomats of the arrest of Russian Alexander Vinnik.
The next day, the US Department of Justice announced that Vinnik had appeared before an American court for the first time.