German Chancellor Angela Merkel walks past a portrait of former German Chancellor Helmut Kohl as she arrives to sign the condolences book at German Chancellery in Berlin, capital of Germany, on June 18, 2017. Former German Chancellor Helmut Kohl died at his home in Germany's Ludwigshafen on June 16, 2017 at the age of 87. (Xinhua/Shan Yuqi)