On June 21, 2003, Thai Prime Minister Thaksin Shinawatra met with visiting Foreign Minister Li Zhaoxing in Chiang Mai.

Thaksin welcomed Li's participation in the Second Ministerial Meeting of the Asia Cooperation Dialogue (ACD). He said that the affection between Thailand and China was just like that between family members, and the effective cooperation between them had brought about practical benefits to the two peoples. He said the recent agreement between the two countries on vegetable and fruits tariffs was a good example of Sino-Thai cooperation. He said Thailand was willing to advance strategic and comprehensive cooperation with China, and to cooperate with China within the ACD framework in an effort to promote prosperity and stability in Asia.

Li Zhaoxing said that Thailand was a friendly neighbor of China in Southeast Asia and the two countries had treated each other sincerely and trusted each other. The China-Thailand relations were exemplary among countries of different systems. He said China had listed Thailand as one of the most important cooperative partners in the region and was willing to further promote high-level official exchange between the two countries and to expand reciprocal cooperation in more fields so as to push the all-facet and high-level cooperative relations to a new level.

On the upcoming ACD meeting, Li said that the ACD, initiated by Thaksin, was of strategic importance and was a good thing for peoples from various Asian countries. He stressed on China's further support for and participation in the ACD activities.

After the meeting, the foreign ministers of the two countries signed the Treaty between the Kingdom of Thailand and the People's Republic of China on Mutual Assistance in Criminal Matters. Thaksin attended the signing ceremony.

Li also met with the foreign ministers of Bangladesh, Pakistan, Indonesia and the Philippines. He stressed that the foothold of the China’s policy towards neighboring countries was remaining good friends and good partners with neighbors and was ready to strengthen regional cooperation to make contribution to the peace and development of Asia and the whole world at large.

On the same day, Li also attended informal breakfast meeting on anti-drug issue among China, Thailand, Myanmar, Laos and India. The foreign ministers and delegates of the five countries reached consensus to strengthen coordination, especially on the fight against planting and selling of drugs near border areas of the five countries.