German Chancellor Angela Merkel (L) and French President Emmanuel Macron (R) shake hands after leaving books at the Peace Library during the opening session of the Paris Peace Forum as part of the commemoration ceremony for Armistice Day, 100 years after the end of the First World War, at the Villette Conference Hall in Paris, France, November 11, 2018. - The Paris Peace Forum is a new annual event based on international cooperation and aimed at tackling global challenges and ensuring durable peace. (Photo by GONZALO FUENTES / POOL / AFP)