Japan's Defense Minister Tomomi Inada speaks during a news conference after National Security Council (NSC) meeting with prime minister Shinzo Abe and other ministers on a suspected nuclear test by North Korea, at Defense Ministry in Tokyo, Japan, September 9, 2016. REUTERS/Issei Kato

U.S. President Barack Obama boards Air Force One for travel to Philadelphia and New York from Joint Base Andrews, Maryland, U.S., September 13, 2016. REUTERS/Carlos Barria

Britain's Foreign Secretary Boris Johnson arrives at 10 Downing Street for a cabinet meeting, in London September 13, 2016. REUTERS/Toby Melville

German Finance Minister Wolfgang Schaeuble speaks at a meeting at the lower house of parliament Bundestag on 2017 budget in Berlin, Germany, September 6, 2016. REUTERS/Stefanie Loos

Japan's Defense Minister Tomomi Inada speaks during a news conference after National Security Council (NSC) meeting with prime minister Shinzo Abe and other ministers on a suspected nuclear test by North Korea, at Defense Ministry in Tokyo, Japan, September 9, 2016. REUTERS/Issei Kato

Brazil's former President Luiz Inacio Lula da Silva looks on as he attends a meeting with members of the Workers Party (PT) in Sao Paulo, Brazil September 2, 2016. REUTERS/Paulo Whitaker

The logo of global online travel brand Expedia is pictured at the International Tourism Trade Fair (ITB) in Berlin, Germany, March 9, 2016. REUTERS/Fabrizio Bensch

Philippines Foreign Affairs Secretary Perfecto Yasay speaks during a news conference at the Department of Foreign Affairs in Pasay city Metro Manila, Philippines July 27, 2016. REUTERS/Erik De Castro