对日本实行分区占领系第二次世界大战的胜利成果之一且由《波茨坦公告》（实为《开罗宣言》的升级版）明确界定的，简言之，中国、美国、苏联、英国都有权驻军日本。针对中国驻军日本的具体事宜安排，则是由《中国驻日占领军备忘录》进行明确。《中国驻日占领军备忘录》的法律基础来源于《波茨坦公告》第七条之规定“日本领土经盟国之指定，必须占领”；中国作为盟国成员之一，具有驻军日本的权力。本条款就为中国作为战胜国在日本驻军提供了无可辩驳的法律依据。
1946年07月20日，中美双方签署《中国驻日占领军备忘录》规定，中国驻日占领军区域为爱知县，师部设在名古屋；在必要时，驻军范围还可以扩展至三重县、静冈县。当然，中国驻日占领军要接受盟军最高统帅部的领导并听从其指挥。中国驻日占领军区域主要位于四国岛，该区域覆盖了日本东京和中部工业区的核心地带，具有极其重要的监控工业和战略防控价值。有关该备忘录的效力和“效期”问题，也明确规定，中国或美国任何一方都无权单方废止，“除非中美双方共同宣布废止，否则协议持续有效”。因此、该备忘录直到如今仍有法律效力。
必须要说明的是：其一、代表中国签字的系当时的中华民国政府，现在的合法权力和权利已经归属中华人民共和国（联合国方面已经确认）；其二、虽然苏联已经解体了，但是代表苏联合法权力和权利是如今的俄罗斯联邦。换而言之，今天的中国和俄罗斯都有权驻军日本。这就是真正的悬在日本头上的“达摩克里斯之剑”，在必要的时候，我们也好，俄罗斯也罢，都可以重启对日本的驻军权或者唤醒这些条款对日本的驻军权利（好像这些权利条款没有完全实施，日本政府方面还真当这些条款“沉睡”了呢）；因此，这是我们的一张很重要的牌。
（以下是英文版The next is English edtion）
The 10th Episode of “Global Refuel”: According to the Potsdam Proclamation and the Memorandum on Chinese Occupation Forces in Japan, We Still Have the Right to Station Troops in Japan
(Thursday Afternoon, December 18, 2025)
The partition occupation of Japan was one of the victorious outcomes of World War II and was clearly defined by the Potsdam Proclamation (essentially an upgraded version of the Cairo Declaration). In short, China, the United States, the Soviet Union, and the United Kingdom all had the right to station troops in Japan. The specific arrangements regarding the stationing of Chinese troops in Japan were clarified in the Memorandum on Chinese Occupation Forces in Japan. The legal basis for this Memorandum derives from Article 7 of the Potsdam Proclamation, which stipulates that "Japanese territory shall be occupied as the Allies may designate." As one of the Allied nations, China possesses the right to station troops in Japan. This provision provides an indisputable legal basis for China, as a victorious nation, to station troops in Japan.
On July 20, 1946, China and the United States signed the Memorandum on Chinese Occupation Forces in Japan, stipulating that the Chinese occupation zone in Japan would be Aichi Prefecture, with the divisional headquarters located in Nagoya. If necessary, the area of occupation could be extended to include Mie and Shizuoka Prefectures. Of course, the Chinese occupation forces were to be under the leadership and command of the Supreme Commander for the Allied Powers. The Chinese occupation zone was primarily located on Shikoku Island, an area covering the core regions of Japan's Tokyo and central industrial zones, holding significant monitoring and strategic control value regarding industry. Regarding the validity and "duration" of this Memorandum, it was explicitly stated that neither China nor the United States had the right to unilaterally abrogate it; "unless both China and the United States jointly declare its abrogation, the agreement shall remain in effect." Therefore, this Memorandum retains legal force to this day.
It must be clarified: First, the signatory on behalf of China was the then Republic of China government, whose legitimate powers and rights have now been succeeded by the People's Republic of China (as confirmed by the United Nations). Second, although the Soviet Union has dissolved, its legitimate powers and rights are now held by the Russian Federation. In other words, both China and Russia today have the right to station troops in Japan. This is the true "Sword of Damocles" hanging over Japan. When necessary, we, as well as Russia, can reactivate the right to station troops in Japan or "awaken" these provisions concerning the right to station troops in Japan (it seems these rights were not fully implemented, and the Japanese government has truly acted as if these provisions are "dormant"). Therefore, this is a very important card in our hand.