Constitutional Court of Russia
During Russia's civic protest movement in 2011-2013, Parkhomenko was one of the leading figures of the movement. In the fall of 2012 he was elected a member of the Russian Opposition Coordination Council. Parkhomenko was instrumental in organizing mass rallies in Moscow in Winter 2011 – Spring 2012. In the spring of 2012, he co-founded the League of Voters and initiated mass lawsuits against government election fraud. This activity resulted in March 2013 in Constitutional Court of Russia hearing where the Court ruled that Russian voters should be allowed to appeal election results directly.