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 with improvised explosive devices. After those events, the United Kingdom government lowered its terrorism alert for Buenos Aires from "very likely" to "likely". 2018 G20 Buenos Aires summit "" The 2018 G20 Buenos Aires summit, was the thirteenth meeting of Group of Twenty (G20), which was held on 30 November and 1 December 2018 in the city of Buenos Aires, Argentina. It was the first G20 summit to be hosted in South America. President Mauricio Macri of Argentina assumed the one-year G20 presidency on 30 November 2017, during an official ceremony at the Kirchner Cultural Centre in Buenos Aires. President