The relationship between such Asia-Pacific powers, as India and China, has recently become a significant factor of how regional security is being maintained and how efficient the regional multilateral cooperation can be. The two states are close neighbours, possessing a long border, and both are presented in high-profile international institutions, e. g. the BRICS. At the same time, they are involved in a long-term border controversy, which sometimes pushes the relations to the verge of war. In addition, India and China are diverged by contradictions in other areas, primarily in economic aspects, and their competition for influence at the international level and in various regions of the Global South.
The aim of this paper is to trace, how the Sino-Indian conflict, on the one hand, and their cooperation, on the other hand, developed throughout the recent 20 years, and try to answer the question, how it all shaped their status for each other, namely, the one of a partner, a rival or an enemy. The author consequently studies the landmark events in border conflict since the beginning of the 21st century, the political exchanges between China and India meanwhile, and the basic trends of economic and military cooperation and competition between the two countries. In conclusion, the results of the research are presented, and the possible impact of Sino-Indian ambivalent relationship on Russian policy towards them and on the work of international institutions involving both countries, is discussed.