MANCHESTER, ENGLAND - OCTOBER 23: The President of the People's Republic of China Xi Jinping tours the National Graphene Institute at Manchester University with the Chancellor of the Exchequer George Osborne on October 23, 2015 in Manchester, England. After listening to a presentation from Dame Nancy Rothwell, the party toured the University Centre which leads the world in graphene research and is one of the most important centres for commercialising the one-atom-thick material. (Photo by Richard Stonehouse - WPA Pool/Getty Images)
WASHINGTON, DC - JANUARY 28: President Donald Trump speaks on the phone with Chancellor of Germany Angela Merkel in the Oval Office of the White House, January 28, 2017 in Washington, DC. On Saturday, President Trump is making several phone calls with world leaders from Japan, Germany, Russia, France and Australia. (Photo by Drew Angerer/Getty Images)
Chinese newspaper front pages show their coverage of marches held in response to the recent Islamist attacks that killed 17 people, most at the Paris offices of satirical magazine Charlie Hebdo, at a newsstand in Beijing on January 12, 2015. About a hundred thousand people rallied worldwide in solidarity with France on January 11, with marchers across Europe and the Middle East chanting "Je suis Charlie" and holding pens in the air. AFP PHOTO / WANG ZHAO (Photo credit should read WANG ZHAO/AFP/Getty Images)
