At a press briefing at Chong Wa Dae in central Seoul, National Security Adviser Wi Sung-lac said Lee will deliver an address at the U.N. General Assembly in New York on Tuesday afternoon, outlining his administration's vision for peaceful coexistence on the Korean Peninsula as well as proposals for U.N. reform and South Korea's role in addressing global challenges.
The 81st General Assembly's general debate opens Tuesday and runs through Sept. 28.
Lee is also scheduled to meet U.N. Secretary-General António Guterres and seek contacts with leaders from the United States, Australia and other countries on the sidelines of the gathering.
"We plan to hold separate contacts in various formats with leaders of major countries, including the United States and Australia," Wi said. "Through these contacts, we aim to continue close exchanges between leaders and discuss ways to cooperate to advance our national interests."
Attention will be focused on whether Lee meets U.S. President Donald Trump. Any encounter would come as Seoul and Washington remain in negotiations over implementation of South Korea's US$350 billion investment package in the U.S., while the two countries have also been discussing Seoul's role in maintaining freedom of navigation in the Strait of Hormuz.
Lee will also attend a business forum in New York the following day, where he is expected to promote South Korea's artificial intelligence (AI)-related policies, capital-market reforms and investment environment to business and financial leaders.
Later in the day, Lee will head to Mexico City for a state visit at the invitation of President Claudia Sheinbaum. The two leaders will hold one-on-one and expanded summit talks on Thursday, followed by the exchange of a slew of memorandums of understanding (MOUs), a luncheon and a joint press announcement.
The visit will mark the first state visit to Mexico by a South Korean president since former President Lee Myung-bak visited in 2010. Seoul plans to seek deeper cooperation with Mexico in trade, investment and supply chains as well as energy, critical minerals, AI, aerospace and defense.
Mexico is South Korea's largest trading partner in Latin America. Bilateral trade totaled about $20.6 billion in 2025, with South Korea exporting $12.1 billion and importing $8.5 billion, according to the Foreign Ministry. More than 500 South Korean companies operate in Mexico, while Seoul has also sought to restart negotiations on a bilateral free trade agreement.
Lee is scheduled to leave Mexico on Saturday and return home on Sunday.
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