SEOUL — South Korean prosecutors accessed restricted areas at Osan Air Base during an investigation into activities by the former South Korean administration directed at North Korea. This development reflects deepening friction in the US-South Korea alliance under President Lee Jae Myung.

Earlier in the week of the reported leak, eight South Korean students were detained for allegedly breaking into Osan Air Base while shouting anti-U.S. slogans. The base serves as a key installation for United States forces in the region.

A Lee administration official released secret information on North Korean nuclear activities provided by the United States. Intelligence sharing, advanced technology cooperation, defense industrial integration, financial coordination, and resilient supply chains depend on confidence that partners will safeguard sensitive information, uphold long-term commitments, and remain accountable despite changes in government.

Jae Myung assumed the office of President of South Korea in mid-2025. Since taking office, he has expressed critical views of US forces and foreign policy actions. South Korean President Jae Myung referred to U.S. forces in South Korea after World War II as an 'occupying force.'

As a presidential candidate, Jae Myung stated that Taiwan was none of South Korea’s business. He also posted comments on social media equating Israeli military actions with the Holocaust. The Israeli government lodged a formal complaint regarding Jae Myung's social media comments.

The South Korean administration sent $500,000 to Iran for humanitarian aid. These actions have drawn attention from international partners and domestic critics alike.

Jae Myung was accused of being involved in the unauthorized transfer of US$8 million to North Korea while serving as governor of Gyeonggi Province. Jae Myung denies charges of involvement in the unauthorized transfer of funds to North Korea. A former subordinate of Jae Myung has been convicted in relation to the unauthorized transfer of funds to North Korea.

Kim Min-Seok served as Prime Minister of South Korea until recently. Kim Min-Seok is running to head the ruling Democratic Party of Korea. Former South Korean Prime Minister Kim Min-Seok and the head of the ruling party were imprisoned as younger men for pro-North Korea acts against the U.S. ambassador’s residence and a U.S. Information Agency office in South Korea.

An influential figure associated with South Korea's ruling party declared that Trump’s America is 'the apex of Yankee imperialism.' South Korean authorities arrested pastors regarded as enemies by the Lee administration.

US Undersecretary of War Elbridge Colby called South Korea a 'model ally' while visiting Seoul. The US alliance remains critical for South Korea's security and deterrence capabilities.

The treatment of the American company Coupang by South Korean officials has attracted US Congressional attention and criticism. South Korea has a world class defense industry that provides advanced weaponry for nations including Indonesia and Poland. South Korea has offered to help America’s shipbuilding industry recover.

The United States and South Korea are bound by a mutual defense treaty signed in 1953. South Korea's security depends on the alliance with the United States. For South Korea, deterrence will continue to depend primarily on the U.S. alliance.

South Korea stands at the intersection of nuclear deterrence, China-U.S. competition, technological rivalry, supply chain resilience, and democratic cooperation. South Korea's prosperity depends on an open global economy. South Korea's future competitiveness depends on reliable technology networks.

Technological resilience requires secure networks for protecting sensitive knowledge and coordinating investment. Economic security depends on diversified markets, suppliers, and production chains. PureSource News previously reported that South Korea applied to join the CPTPP trade pact.

For most of the post-war era, power, legitimacy, and cooperation reinforced one another. American leadership underwrote security, open markets, and freedom of navigation. Universal institutions such as the United Nations, the World Trade Organization, and the nuclear nonproliferation regime provided common rules and legal legitimacy.

Security, economic governance, political legitimacy, and practical cooperation are no longer occurring in the same institutions or even among the same groups of states. Russia’s invasion of Ukraine exposed the inability of existing institutions like the United Nations to prevent or halt great power aggression. Competition between China and the United States over semiconductors, artificial intelligence, critical minerals, and maritime supply chains blurs the traditional boundary between economics and security.

Smaller groups of like-minded partners can coordinate quickly, protect sensitive technologies, strengthen supply chain resilience, and respond effectively to shared threats. Minilateral coalitions lack broad legitimacy. Universal institutions provide legal authority and political inclusion but often struggle to act.

Wider institutions remain essential for common rules, political inclusion, and international acceptance. South Korea should seek to develop connective power: the capacity to align security commitments, economic partnerships, technological networks, and multilateral institutions around compatible purposes. Connective power rests on institutional access, a reputation for reliability, effective brokerage, and contributions to regional and global public goods.

States with connective power standing can bridge alliances, functional coalitions, and wider institutions, and thereby shape the terms of cooperation. The post-war order cannot simply be restored because the architecture that sustained it has already changed. The more plausible alternative to the post-war order is not a singular order but several layered and overlapping ones.

States will pursue national interests through different arrangements while cooperating where regional stability and global public goods require collective action. The most indispensable states will not necessarily dominate every arena, but will make cooperation across arenas possible. For South Korea, bridging these systems is a national imperative.

South Korea's security, prosperity, technological competitiveness, and diplomatic autonomy depend on its ability to operate across multiple institutional systems. An international conference titled 'Democratic Multilateralism at the Edge' was held in Seoul on April 20, 2026. The conference was jointly organized by the Seoul Forum for International Affairs and the Hairan Series of Korea University’s Institute for Interdisciplinary Unification Studies.

Moon Jae In served as President of South Korea from 2017 to 2022. South Korea was established in 1948. Research titled Prosecution Reform in South Korea: Elections, Independent Prosecutors, Expanded Police Powers, and Grand Juries was published in 2021 in SSRN Electronic Journal. The Transportation Department published a rule titled Drug and Alcohol Testing of Certificated Repair Station Employees Located Outside of the United States on December 18, 2024.

The access by South Korean prosecutors to restricted areas at a major US air base reflects the fragility of trust required for intelligence sharing and defense integration. As South Korea navigates a complex geopolitical landscape marked by China-US competition and technological rivalry, its ability to maintain reliable alliances is central to its national security and economic prosperity. The incident occurs within a broader context of shifting global institutions, where minilateral coalitions and universal bodies struggle to provide consistent frameworks for cooperation.

For South Korea, bridging these disparate systems is a national imperative. Its security, prosperity, technological competitiveness, and diplomatic autonomy depend on operating across multiple institutional systems while maintaining confidence among partners. The investigation into former administration activities and the subsequent breach of restricted military areas highlight the domestic political tensions that can impact international commitments. As the country seeks to develop connective power, ensuring accountability and reliability remains essential for shaping the terms of cooperation in an evolving global order.

Why It Matters

Intelligence sharing, advanced technology cooperation, and defense industrial integration depend on confidence that partners will safeguard sensitive information and uphold long-term commitments. South Korea's security and deterrence capabilities rely primarily on the U.S. alliance, while its future competitiveness requires reliable technology networks. Disputes over classified data and leadership rhetoric challenge the trust necessary to maintain these critical defense and economic arrangements.