By Panu Wongcha-um BANGKOK (Reuters) -The leaders of Japan and Thailand announced a new defence agreement on Monday as well as plans to upgrade their economic relations, as Japanese Prime Minister Fumio Kishida wrapped up the last leg of a three-nation tour of Southeast Asia. The agreement would facilitate the transfer of defence hardware and technology from Japan to Thailand, which has one of the region’s biggest and most equipped armies and a long history of ties with the United States military. Further details of the deal were not disclosed. “This will help improve national defence and supp…