Russia - Passport & Nationality - Russian Citizenship by Registration
Children of former Russian Federation citizens, born after the termination of parents' Russian Federation citizenship, may register for citizenship within five years after their 18th birthday.
Former citizens of the USSR who resided on the territory of the former USSR and who came to reside on the territory of the Russian Federation after February 6, 1992, if they declared their intention to acquire citizenship of the Russian Federation by December 31, 2000.
Stateless persons permanently residing on the territory of the Russian Federation on the day of enactment of the present Law, or on the territory of other republics of the former USSR as of September 1, 1991, both of whom within one year of enactment of the present Law declare their intention to acquire citizenship of the Russian Federation.
Foreign citizens and stateless persons, irrespective of their domicile, who themselves are, or one of whose direct ancestors were, a subject of Russia by birth, and who, within one year of enactment of the present Law, declare their intention to acquire the Russian Federation citizenship.