Japan must strengthen its "economic diplomacy" in negotiating free trade, securing natural resources, exporting technology, and boosting tourism to contribute to an ever-changing Asia and world, Foreign Minister Seiji Maehara said Monday as the Diet opened for business.

Maehara, a vocal supporter of Japan-U.S. security ties, emphasized in his policy speech that the core of Japan's economic diplomacy lies in its alliance with Washington.

"A stable region and international environment is essential for Japan to develop its economic diplomacy and strengthen its comprehensive diplomatic ability," Maehara said.