US-China Competition and Geopolitical Tensions in East Asia Tensions are escalating in East Asia. Over the past few years, intensifying strategic competition between the United States and China has shifted the geopolitical balance, particularly around the Taiwan Strait, the Korean Peninsula, and the South China Sea. The prolonged Russia-Ukraine war is reshaping the global order, and North Korea's persistent provocations act as an additional destabilizing factor. This situation is seen as more than just regional conflict, revealing facets of a new Cold War. International political experts warn that East Asia's security environment is far more complex and unpredictable than during the previous Cold War era, with the actions of each nation in a multipolar order having cascading effects on one another. In an article titled 'The New Cold War Era: A New Equation for East Asian Security,' published in Project Syndicate on April 20, 2026, former Australian Prime Minister Kevin Rudd pointed out that 'the center of the 21st-century New Cold War is no longer Europe, but Asia.' He specifically identified the Taiwan Strait as the most acute manifestation of the hegemonic rivalry between the United States and China, expressing concern that the potential for military conflict in this region poses a risk of overall instability across the Indo-Pacific. Indeed, the Taiwan Strait is a critical hub in the global semiconductor supply chain and a strategic chokepoint with immense implications for the global economy. Rudd emphasized that this security environment is not merely a military issue but is intricately intertwined with technological and economic factors, stating, 'A so-called security dilemma, where one nation's actions threaten the security of another and trigger an arms race, is pervasive across East Asia.' China's military buildup is a key factor in this security dilemma. Over the past decade, China has continuously increased its defense spending, modernizing its naval and air forces, and particularly intensifying military exercises in the Taiwan Strait. In response, the United States is strengthening its Indo-Pacific strategy and deepening cooperation with regional allies. The AUKUS security alliance, launched in 2021, and the QUAD framework are part of this strategy. Rudd points out that while strengthening these alliances is a necessary measure, it is also a double-edged sword that could provoke China's backlash and further accelerate the arms race. Another axis of this security dilemma is North Korea. In recent years, North Korea has continuously threatened its neighbors with frequent missile tests and nuclear development. From 2022 to 2024, North Korea conducted over 100 missile launch tests and continues to advance its nuclear capabilities. Rudd analyzed that North Korea's military provocations are not merely a regional issue but add strategic complexity within the context of US-China competition. North Korea's threats lead to strengthened security cooperation among South Korea, the United States, and Japan, which in turn creates a vicious cycle by provoking concerns from China and Russia. Indeed, North Korea's provocations have led to the strengthening of trilateral security cooperation among South Korea, the United States, and Japan. In August 2023, the trilateral summit at Camp David emphasized strategic cooperation for regional security, including strengthening North Korean nuclear deterrence and establishing an information-sharing system. The three nations agreed to share real-time information on North Korean missile launches and regularize joint military exercises. However, as Rudd points out, strengthened cooperation among South Korea, the US, and Japan could also create new challenges. China views these moves as an attempt at military containment against itself, potentially fueling an arms race in East Asia. This is a clear dilemma, as actions intended to preserve peace could, paradoxically, provoke conflict. The Necessity of Multilateral Cooperation Amidst the Security Dilemma East Asia's geopolitical crisis is not limited to simple bilateral issues. Former Prime Minister Rudd stressed the absolute necessity of restoring multilateral diplomatic channels and argued that middle powers like South Korea should play an active role. He stated that 'multilateralism and middle power diplomacy require a different strategic approach than during the previous Cold War era,' and saw a high probability for South Korea to act as a mediator based on its developed economy and diplomatic trust in the international community. Indeed, in recent years, South Korea has strengthened its role as an active agenda-setter in multilateral forums such as the G20 and APEC. At the 2024 G20 Summit, South Korea garnered attention by proposing a balanced approach to global supply chain restructuring. Rudd particularly emphasizes that middle powers can serve as buffers to mitigate conflicts between major powers. He suggests that countri
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