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BEIJING, CHINA - AUGUST 30: China's President Xi Jinping (2-L) during his meeting with Sierra Leone President Julius Maada Bio (2-R) at the Great Hall of the People on August 30, 2018 in Beijing, China.Julius Maada Bio is in China for Forum on China-Africa Cooperation which will be held from 03 to 04 September in Beijing. (Photo by Roman Pilipey - Pool/Getty Images)

BEIJING, CHINA - SEPTEMBER 03: Sierra Leone President Julius Maada Bio, left, shakes hands with Chinese President Xi Jinping as they pose for photograph during the Forum on China-Africa Cooperation held at the Great Hall of the People on September 3, 2018 in Beijing, China. (Photo by Andy Wong - Pool/Getty Images)

BEIJING, CHINA - AUGUST 30: China's President Xi Jinping (L) and Sierra Leone President Julius Maada Bio (R) review the Chinese People's Liberation Army honor guard during the welcome ceremony at the Great Hall of the People on August 30, 2018 in Beijing, China.Julius Maada Bio is in China for Forum on China-Africa Cooperation which will be held from 03 to 04 September in Beijing. (Photo by Roman Pilipey - Pool/Getty Images)

BEIJING, CHINA - AUGUST 30: China's President Xi Jinping (L) and Sierra Leone President Julius Maada Bio (R) review the Chinese People's Liberation Army honor guard during the welcome ceremony at the Great Hall of the People on August 30, 2018 in Beijing, China.Julius Maada Bio is in China for Forum on China-Africa Cooperation which will be held from 03 to 04 September in Beijing. (Photo by Roman Pilipey - Pool/Getty Images)

BEIJING, CHINA - SEPTEMBER 02: Sierra Leone President Julius Maada Bio (3nd-L) meeting with Chinese Premier Li Keqiang (4nd-R) at Diaoyutai State Guesthouse on September 2, 2018 in Beijing, China. (Photo by Lintao Zhang/Pool/Getty Images)

BEIJING, CHINA - AUGUST 30: China's President Xi Jinping (R) shows the way to Sierra Leone President Julius Maada Bio (L) during the welcome ceremony at the Great Hall of the People on August 30, 2018 in Beijing, China.Julius Maada Bio is in China for Forum on China-Africa Cooperation which will be held from 03 to 04 September in Beijing. (Photo by Roman Pilipey - Pool/Getty Images)