石破茂派日本代表送上亲笔信，访问中国之前，他要先去一趟东南亚

Group 1 - The visit of Katsuhiro Saito, leader of Japan's Komeito party, to China is significant as it marks the first official visit by a Japanese political leader to China since the onset of tariff negotiations under the Trump administration [1][3] - The letter from Japanese Prime Minister Shigeru Ishiba to China is seen as a signal of Japan's desire to strengthen ties with China amid ongoing trade tensions with the U.S. [1][3] - Japan aims to leverage its relationship with China to enhance its negotiating position with the U.S. during trade discussions, indicating that Japan is not solely reliant on the U.S. for economic partnerships [3][5] Group 2 - Japan is seeking to establish a cooperative relationship with China to bolster its economic resilience against U.S. pressures, especially in light of ongoing U.S.-China trade frictions [5][6] - The focus on Southeast Asia by Japan, including Ishiba's planned visits to Vietnam and the Philippines, highlights the region's growing importance in global supply chains and economic stability [5][6] - The potential for Southeast Asian countries to maintain neutrality in the U.S.-China trade conflict could benefit China's economic cooperation and stability in the region [8]