The victory of the communist forces in the civil war in China resulted in the flight of the government, with the defeated leader Chiang Kai-shek and about 2 million followers, to the island of Taiwan. Hoping for a change in the situation, the President of the Republic of China announced temporary move of the capital of China to Taiwan. At the same time Chinese Communist Party, led by Mao Zedong, took control of the entire territory of mainland China, with the capital in Beijing, announcing the establishment of the People’s Republic of China. This article deals with the assessment of the relationship between those two entities, that have coexisted unchanged since 1949. During this period, they followed different political pathways, but they invariably absorbed international opinion and affected the level of international security. Inspiration to take up this topic came from the significant deterioration of the international situation, influenced by the relationship between the People’s Republic of China and the Republic of China.