１９３５年华北事变，日本侵略势力逐渐深入华北，不但直接损害了英、美帝国主义在华利益，而且严重损害到国民党蒋介石集团在华北的政治和经济利益。在日本侵略者武力威迫下，在全国人民抗日救亡运动的冲击下，在英、美对日态度变化的影响下，蒋介石的对外政策作了某些调整。 The incident in North China in 1935 and the gradual penetration of Japanese aggression into North China not only directly damaged the interests of the British and U.S. imperialists in China, but also seriously undermined the political and economic interests of the Kuomintang Chiang Kai-shek Group in northern China. Under the pressure of the Japanese aggressor forces and under the influence of the National People’s Anti-Japanese National Salvation Movement and under the influence of changes in the attitude of Britain and the United States toward Japan, Chiang Kai-shek made some adjustments to its foreign policy.