President of the European Council Donald Tusk, President of the European Commission Jean-Claude Juncker, Japanese Prime Minister Shinzo Abe, German Chancellor Angela Merkel, Italian Prime Minister Paolo Gentiloni, French President Emmanuel Macron (hidden), US President Donald Trump, Britain's Prime Minister Theresa May and Canadian Prime Minister Justin Trudeau chat at the belvedere of Taormina during the Heads of State and of Government G7 summit, on May 26, 2017 in Sicily.
(MANDEL NGAN/AFP/Getty Images)
Soviet Premier Joseph Stalin, U.S. President Harry Truman, and British Prime Minister Winston Churchill at the conference to negotiate the future of Europe after World War II in Potsdam, Germany on July 23, 1945. (AFP/Getty Images)
U.S. President Donald Trump and Russia's President Vladimir Putin arrive to attend a joint press conference after a meeting in Helsinki on July 16. (Yuri Kadobnov/AFP/Getty Images)
Donald Trump sings the national anthem with a U.S. Army chorus during a "Celebration of America" event on the south lawn of the White House June 5, 2018 in Washington, DC. (Win McNamee/Getty Images)
North Korea's leader Kim Jong Un reacts at a signing ceremony with US President Donald Trump during their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. (SAUL LOEB/AFP/Getty Images)
Canadian Prime Minister Justin Trudeau, German Chancellor Angela Merkel, U.S. President Donald Trump, then-Italian Prime Minister Paolo Gentiloni, French President Emmanuel Macron, Japanese Prime Minister Shinzo Abe, and U.K. Prime Minister Theresa May pose for a photo at the G-7 summit in Sicily on May 26, 2017. (Miguel Medine/AFP/Getty Images)
Former U.S. National Security Advisor Zbigniew Brzezinski and former U.S. Secretary of State Henry Kissinger at the Nobel Peace Prize Forum in Oslo on Dec. 11, 2016. (Terje Bendiksby/AFP/Getty Images)
British Prime Minister Theresa May, German Chancellor Angela Merkel and French President Emmanuel Macron following a meeting on the sidelines of the European Union leaders summit in Brussels, on March 22, 2018. (LUDOVIC MARIN/AFP/Getty Images)
A huge screen in Tokyo flahes news on March 8, 2018 that President Donald Trump and North Korean leader Kim Jong agreed to meet for talks. (TOSHIFUMI KITAMURA/AFP/Getty Images)
