Core Viewpoint - East Asian refineries are expected to continue increasing purchases of US light low-sulfur crude oil by 2026 to diversify supply channels, mitigate geopolitical risks, and enhance refining profits while maintaining diplomatic relations with the US [1][2]. Group 1: Market Trends - East Asian refineries, particularly in South Korea, Japan, and Thailand, are shifting from high-sulfur crude oil to US light low-sulfur crude oil to improve energy supply security and stabilize supply chains [1][2]. - Japan's crude oil imports from the US surged to 106,300 barrels per day in October 2025, a more than 26-fold increase from 4,029 barrels year-on-year, and nearly tripled from 36,200 barrels in September 2025 [1]. Group 2: Economic Factors - The narrowing price differential between Brent and Dubai crude oil futures has made US West Texas Intermediate crude more economically attractive compared to mainstream heavy sour crude, leading to a shift in refining profit margins [2][3]. - South Korea is projected to remain the largest buyer of US crude oil in Asia, with an expected annual purchase of 136 million barrels in 2025 [2]. Group 3: Strategic Partnerships - Thailand has committed to increasing US crude oil purchases as part of a bilateral trade agreement framework announced on October 26, 2025, aimed at deepening cooperation with the US [4]. - South Korea signed a $100 billion energy procurement agreement with the US, which is a key component of a broader trade agreement to reduce mutual tariffs from 25% to 15% [4]. - Japan and the US signed a comprehensive trade and investment agreement on October 28, 2025, which includes Japan's commitment to invest $550 billion in US energy infrastructure and related sectors [4].