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“I will pay tribute to the Japanese people who unwillingly died in the distant land away from home, and think of their hardships,� Naruhito said at a news conference ahead of his July 6-13 trip to Mongolia. His Harvard-educated former diplomat wife, Empress Masako, will accompany him.

Just before the end of the hostilities in 1945, the Soviet Union had declared war on Japan, taking most of about 575,000 Japanese POWs to Siberia. But around 12,000 to 14,000 of them were taken to Mongolia, which was fighting alongside the Soviets against Japan.

Most of the POWs were put to hard labor and construction work for the Mongolian government's headquarters, a state university and a theater that are still preserved in the capital Ulaanbaatar. The prisoners toiled under harsh conditions and scarce food. Japanese records show about 1,700 of them died in Mongolia.

“As we mark the 80th anniversary of the end of the war this year, we should never forget the pain and sorrow of the people,� Naruhito said. “I believe it is important to not forget those who died, deepen understanding of the wartime past and to nurture the peace-loving heart.�

Naruhito has repeatedly stressed the importance of telling the war's tragedy to younger generations, pledging to contribute to efforts to promote the understanding of history and the determination for peace.

The emperor's trip to Mongolia will be his second since he visited in 2007 as crown prince to mark the 35th anniversary of the diplomatic ties between the countries.