Это опять же Россия закрыла эту возможность.
https://ru.usembassy.gov/visas/

U.S. Mission in Russia no longer offers non-diplomatic visa services due to the Russian government’s April 23 notification prohibiting the U.S. Embassy Russia from employing foreign nationals in any capacity. Russian nationals may continue applying for non-immigrant visas at any U.S. embassy or consulate where they can obtain an appointment.

Due to the suspension of immigrant visa services at the U.S. Embassy in Moscow, the U.S. Department of State has designated the U.S. Embassy in Warsaw to process immigrant visas for residents of Russia. Please find additional information here.