Abstract
This study analyzes the geopolitical strategies of the United States and Japan in light of the ongoing Russia-Ukraine conflict, examining how their historically developed geopolitical doctrines manifest in the current global context.It explores the evolution of US foreign policy from Mackinder's Heartland theory to Spykman's Rimland concept, emphasizing the US's strategic interests in preventing any emerging dominant powers that could threaten its security.The study also delves into Japan's distinct geopolitical trajectory, from its isolationist past to its more proactive engagement in global security issues, especially in cooperation with the United States and NATO.The research highlights Japan's cautious but significant response to the Ukraine crisis, marked by economic sanctions and strategic alliances, while balancing its longstanding territorial disputes with Russia.Additionally, it examines the broader implications of the US and Japan's policies on global security architecture, focusing on their shared commitment to a rules-based international order.The study concludes by discussing potential shifts in US foreign policy following the 2024 presidential elections and how these changes might affect both nations' strategic objectives and their roles in regional and global security.This analysis provides insight into the evolving dynamics between the US, Japan, and other global powers in the context of current geopolitical tensions.