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The leaders of Japan and Thailand have announced a new defence agreement as well as plans to upgrade their economic relations as Japanese Prime Minister Fumio Kishida wrapped up the last leg of a 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 support investment from Japan in this activity which is an important goal for Thailand," Thai Prime Minister Prayuth Chan-ocha said in a joint statement read alongside Kishida.
Prayuth said he discussed improvements in supply chains and the drafting of a five-year economic partnership with Japan, Thailand's biggest investor.
Southeast Asia has for decades been an important region for Japan, hosting some of its biggest names in industry, from infrastructure, engineering and industrial zones to the manufacturing of vehicles and electronics.
On his three-day trip Kishida also visited Vietnam and Indonesia, where Japanese firms maintain a large presence.
As the leader of Asia's sole member of the G7, Kishida discussed Russia's invasion of Ukraine during his trip to Southeast Asia, where only one country - Singapore - has joined sanctions against Russia.
Russia calls its actions in Ukraine a "special operation".
Nine Southeast Asian countries backed a United Nations resolution in March condemning the invasion, however, and Kishida thanked Prayuth for Thailand's support.
"I agreed with Prime Minister Prayuth that in any region the violation of sovereignty and territorial integrity, or unilateral changes to the status quo with force, should not be tolerated," he said.
Cabinet Secretary for Public Affairs Noriyuki Shikata earlier on Monday told reporters that Japan would be extending a 50 billion yen ($A545 million) loan to support Thailand's COVID-19 mitigation efforts.