Saudi Arabia's King Salman bin Abdulaziz al-Saud (L) is welcomed by Japanese Emperor Akihito (R) prior to their luncheon at the Imperial Palace in Tokyo on March 14, 2017.
Saudi Arabia's King Salman arrived in Tokyo on March 12, making the first visit to Japan by a monarch from the oil-rich nation in nearly five decades. / AFP PHOTO / JAPAN POOL AND JIJI PRESS / STRINGER / Japan OUT        (Photo credit should read STRINGER/AFP via Getty Images)