The purpose of this study is to understand the characteristics of the ongoing Russia-Ukraine War and predict its future developments using Clausewitz's Trinity Theory. This study is based on three questions. First, would it be possible to explain the aspects of the War based on Clausewitz's Trinity Theory? Second, If so, how can we explain the changes in the aspects of the War? Third, how can the future development of the War be explained by the Trinity Theory? The result of the study confirms that Clausewitz's Trinity Theory is valid for explaining the patterns and characteristics of the Russia-Ukraine War, in particular, in terms of the size of the trinity balance.