Ahead of Blinken's trip, the United States' top diplomat for East Asia, Daniel Kritenbrink, told reporters there had been "virtually zero progress" in efforts to get Myanmar's junta to reduce violence, free political prisoners and talk to the democratic opposition.

VIENTIANE, Laos (AP) — Southeast Asian leaders gathered in the capital of Laos on Wednesday for an annual regional forum that will focus on tackling the prolonged civil war in Myanmar and territorial tensions in the South China Sea, two key challenges that have long tested the bloc's credibility.

President Yoon Suk Yeol and Japanese Prime Minister Shigeru Ishiba are set to hold their first summit on the sidelines of the Association of Southeast Asian Nations (ASEAN) summit in Laos, Yoon's office said Wednesday.