Constitution of Russia, adopted 1993, the current constitutional order of Russia.
Source Constitution of Russia (Wikipedia)
Russia has a federal constitution but is described as not democratic in practice.
Source Center for the Study of Federalism: What is Federalism?
Russia joined in 1998 to form the G8; suspended in March 2014 following the annexation of Crimea, returning the forum to the G7.
Source G7 (Wikipedia)
This source names Russia directly: "powers, including the United States, Russia, and China, are not parties, which has led to disputes over the Court's authority to issue arrest warrants against their nationals or leaders, and some..."
Source International Criminal Court (Cornell LII)
This source names Russia directly: "tension, foreign intervention from Russia and Britain, and the onset of the First World War."
Source Constitutional Revolution, Iran (Britannica)
Britannica names Russia among the countries using proportional representation.
Source Proportional Representation (Britannica)
This source names Russia directly: "country overview article for Russia, covering its formation, government and history."
Source Russia (Britannica)
This source names Russia directly: "It has fifteen members: five permanent (China, France, Russia, the United Kingdom and the United States) each holding a veto over substantive resolutions, and ten elected for two-year terms."
Source United Nations (Wikipedia)
Russia is one of the five permanent, veto-holding members of the UN Security Council.
Source UNRV Roman History: Tribunes of the Plebs