Archive of the President of the Russian Federation

The Archive of the President of the Russian Federation (Russian: Архив Президента Российской Федерации) is a Russian state archive established in 1991 and managed by the Presidential Administration of Russia. It remains classified almost entirely and preserves records of the President of Russia and Presidential Administration of Russia, as well as documents of the highest organs of the Communist Party of the Soviet Union.

The Wikipedia page is, with more information here.