2009 G20 London summit London Summit and to co-ordinate their actions. The meeting was organised at the initiative of German Chancellor Angela Merkel. The leaders agreed that markets, financial institutions and the wide range of financial assets they create, and hedge funds should be subject to appropriate control. In addition, they called for effective sanctions against tax havens. They also agreed to impose sanctions against countries that intend to undermine their work. Finally, they advocated the doubling of funds available to the IMF. Finance ministers and central bankers of the G20 met in Horsham on 14 March 2009 to prepare for the London Summit.
2018 G20 Buenos Aires summit China related to resolving the escalating 2018 China–United States trade war were a central issue of the summit. On Friday 30 November, ahead of the formal start of the summit, Presidents Peña Nieto and Trump and Prime Minister Trudeau signed the United States–Mexico–Canada Agreement (USMCA), the successor treaty to the 1994 North American Free Trade Agreement (NAFTA). The (CLACSO) and organized a counter-summit, called the First World Forum of Critical Thinking, which took place in the week leading up to the G20 event. It was attended by other politicians such as former Brazilian president Dilma Rouseff, Bolivian vice president Álvaro