Law on languages of peoples of the Russian Federation
The Law on a Unified Graphic Base is the federal law of December 11, 2002 No. 165-ФЗ "On Amendments to Article 3 of the Law of the Russian Federation 'On the Languages of the Peoples of the Russian Federation'", which established the Cyrillic script as the only possible script for all peoples of the Russian Federation.
Source: Wikipedia — Law on languages of peoples of the Russian Federation (CC BY-SA 4.0)