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He acted as the leader of the Russian Party of Social Democracy, which in the mid-1990s fused into United Democrats (a pro-reform alliance that was later reorganized into Union of Rightist Forces).
In this capacity, he was a principled opponent of Gaidar's Russia's Choice and its successors in the parliament, such as the Union of Rightist Forces.
As a result of the agreement between Nikita Belykh and Grigory Yavlinsky, reached in October 2005, the Union of Rightist Forces and Yabloko formed a coalition, Yabloko-United Democrats, to contest the Moscow City Duma elections on December 4, 2005.