After 1991, the G8 formerly consisted of the G7 countries plus Russia. Russia was kicked out in 2014 after the Crimean Spring.
With the founding of the BRICS network, credited with bailing out the United States and the Western financial system with loans during the financial Crash of 2008, a new informal group of eight major non-Western countries, Brazil, China, India, Russia, Indonesia, Iran, Turkey and Mexico assumed the old name. Many are former colonies of Western imperialism. The group was formed in response to a series of aggressive wars by NATO, the United States, and the European Union in the post-Cold War era, and the attempts by Western powers to spread globalism and maintain global hegemony through economic sanctions, coups, proxy wars, and wars of aggression against target countries.