Part I
The contemporary Korean Peninsula
1 Introduction
Korea is the center of Northeast Asia and a transitional geographic space where the Eurasian landmass meets the Asia-Pacific maritime domain. Hence Korea is a âpivot pointâ and a âbridgeâ between China and the Japanese archipelago in the terminology of logistics managers (Armstrong et al. 2006). Koreaâs importance has risen with economic globalization, but its strategic significance dates back much further in the history of regional rivalries, as a star in the China-centered universe or as a âdagger pointed at the heart of Japan,â as military strategists put it in the nineteenth century. Beyond sheer geography, Koreaâs connectedness to the regionâs key states is also significant. Both Koreas have an alliance with a major power, and the USâSouth Korea alliance and ChinaâNorth Korea friendship treaty inevitably help shape Asiaâs security architecture. The Peninsula is also optimally placed to become a comprehensive regional economic hub. South Korea partially serves this role already, despite its blocked land-access to China, suggesting the economic promise that the two Koreas could enjoy together if North Korea were to normalize licit economic connections with neighboring states.
Koreaâs geopolitical, strategic, and economic centrality highlight the challenges and opportunities the Peninsula presents for international relations theorizing and empirical patterns in foreign policy. On the theoretical side, international relations scholars have used tenets of liberalism, realism, constructivism, and selectorate theory to study the Southâs surprisingly rapid transformation into a wealthy, high-income, democratic country; puzzle over the Northâs anachronistic survival in a post-Cold War environment; analyze how Seoul employs the USâSouth Korea alliance to flourish in a rough neighborhood; elucidate Pyongyangâs long-standing ability to play (frequently well) a weak diplomatic hand; and examine how North Korea could reform and/or how North Korea and South Korea could develop trust and cooperative practices (Kim 2000; Bueno de Mesquita 2004; Kim 2012; Nah 2013; Snyder and Easley 2014; Chun 2015; Sherrill 2016).
Meanwhile, the international communityâand in particular other Northeast Asian regional statesâhave devoted great attention to the Korean Peninsula over the last 70 years. The Korean War, of course, had the support of Stalinâs Soviet Union (USSR), involved a multi-state military response led by the USA under the auspices of the United Nations (UN), and eventually witnessed massive intervention by Chinese forces. In the post-Korean War period, the international community has worked to establish conditions by which the South and North could develop economically, achieve reconciliation and peace, and perhaps unify. Efforts have included UN missions, UN Security Council resolutions, Four-party talks (South Korea, North Korea, USA, China), Six-party talks (South Korea, North Korea, USA, China, Russia, Japan), Sunshine Policy (led by South Korea with international support), hardline policy (e.g., maximum pressure), and strategic patience, none of which has sustainably met its objectives. The bilateral USâSouth Korea and ChinaâNorth Korea treaty relationships devote significant effort to preserving stabilityâranging from deterrence to cooperationâon the Korean Peninsula and in the larger Northeast Asia region (Easley 2020). Serious conflict on the Korean Peninsula has been prevented since 1953, but periodic crises threaten to unravel a fragile truce. North Koreaâs nuclear arsenal occasions South Korean and Japanese experts to study the efficacy of US-backed extended deterrence, and, under certain scenarios, whether they should also develop nuclear weapons (Kim 2019; Lee, B. 2019; Song 2019; Yonhap News Agency 2020). The international community opposes this development, and relies on international institutions, regimes, and norms to prevent it.
This chapter focuses on three major themes to reconceptualize and assess the centrality of the Korean Peninsula in Northeast Asia. Section 2 examines the Koreasâ respective relationships with their alliance partners (WashingtonâSeoul, BeijingâPyongyang) and how they fit into the overarching great power regional competition in Asia, especially USâChina rivalry. Also critical is how these relationships frame efforts at maintaining peace and creating conditions for inter-Korean cooperation, and perhaps one day, unification. Section 3 considers the complexities of nuclear deterrence on the Korean Peninsula, both from the perspective of Seoul, which benefits from US extended nuclear deterrence, and Pyongyang, which claims its security is ensured by its own nuclear deterrent. This section also shows how the trajectory of nuclear deterrence on the Korean Peninsula has implications for the international nonproliferation regime. Section 4 turns to the promise of what could be: the economic strength of an integrating Korean Peninsula. A particular focus will be the possibility for inter-Korean rail linkages and the promise they hold for deepening connections between the Korean Peninsula and the wider region. Finally, Section 5 concludes by bringing together these strands of argument into a picture of how a changing Korean Peninsula can transform the Northeast Asian region.
2 Korea and alliances
In the contemporary period, the dialectic of SouthâNorth relations on the Korean Peninsula has emerged from decisions both haphazard and strategic, trivial and momentous. In many ways the haphazard and trivial have led to the strategic and momentous. Two famous incidents illustrate this. Toward the end of World War II (WWII), the Korean Peninsula was hardly treated with strategic gravitas by US policymakers. Indeed, two lieutenant colonelsâCharles Bonesteel and Dean Rusk (later US Secretary of State)âwith little planning and using a National Geographic map, drew the line delimiting the US occupation zone on the Korean Peninsula (Oberdorfer and Carlin 2013).
This areaâlater formalized into a demilitarized zone (DMZ) surrounding a military demarcation line (MDL)ârunning roughly along the 38th parallel north has been the site of Korean division ever since, with enormous strategic consequences. The first of which arrived several years later, in 1950, when US Secretary of State Dean Acheson, perhaps inadvertently, excluded South Korea from the âAcheson Line,â the defense line set by the USA against Soviet and other communist forces in Asia (Matray 2002). Although North Korea was already planning to attack the South, North Korean leader Kim Il Sung was emboldened, taking it as a sign of US abandonment of South Korea in case of the Northâs invasion. However, Cold War logic dictated that the USA could not allow an anti-communist South Korea to fall to communist North Korea aligned with the Soviet Union (USSR) and the Peopleâs Republic of China (PRC). Consequently, the USA entered the NorthâSouth civil war under a UN mandate, made possible by the fact that the USSR boycotted the UN Security Council (UNSC) votes as a protest against Chinese UNSC representation via the Republic of China (Taiwan), thus depriving it of a veto against UNSC Resolutions 82 and 83 authorizing international military action to restore the status quo ante following the North Korean-caused âbreach of peaceâ on the Korean Peninsula. The US-established multinational force of UN sending states, under a US-led UN Command, pushed North Korea back across the 38th parallel and northward toward the border with mainland China. Following both the dictates of its own perceived national security interests and appeals from both Stalin and Kim, China intervened on North Koreaâs side in October 1950 with a large âvolunteerâ army.
By late Spring 1951 the opposing forces had mostly fought to a stalemate, with lines settled within a few kilometers of either side of the 38th parallel. The war continued in this stalemated fashion until its exhausted conclusion in an armistice signed in July 1953. A reduced UN Command remained on the Korean Peninsula south of the DMZ, the USA established a formal treaty-based alliance with South Korea in 1954, and Washington and Seoul grew ever closer together economically and militarily, notably with the establishment of United States Forces Korea (USFK) in 1957 and the USâSouth Korea Combined Forces Command (CFC) in 1978. Despite a rockier post-Korean War relationship, in 1961 North Korea and China also formed an alliance, indeed the only formal mutual defense treaty that either Pyongyang or Beijing has signed with any other state. The 1961 SinoâNorth Korean Mutual Aid and Cooperation Friendship Treaty is expected to be renewed in 2021 as it was in 1981 and 2001.
In 1954 and 1961 it would have been difficult to imagine how today the existence of USâSouth Korea and ChinaâNorth Korea alliances would play such a pivotal role in geopolitical and security issues in Northeast Asia. The main US ideological rival was the USSR, and both states were far more focused on the European theater than Asia. China was an economic and political basket case during most of the 1950sâ1970s, and both South and North Korea were impoverished. Few predicted that South Korea would become a rich nation, a major trading partner in a global capitalist system, and a beacon of technological innovation. Even fewer predicted that North Korea would become a de facto nuclear weapons power.
Today, of course, the Korean Peninsulaâboth rich South and nuclear Northâare at the juncture of SinoâUS great power competition in East Asia (indeed in the wider Indo-Asia-Pacific). The USâSouth Korea alliance is a critical part of the US-led security architecture in the region, which is transitioning from a âhub-and-spokesâ to networked alliance system including also Japan, Australia, the Philippines, Thailand, and nontreaty (but still important) defense partners like India and Singapore. This adaptable architecture has helped maintain a rules-based order in the region since WWII. At the same time, the USâSouth Korea alliance has expanded in several dimensions to become more comprehensive. A USâSouth Korea Free Trade Agreement underwrites large volume, high-quality bilateral commercial trade, while shared republican political values and friendly diplomatic and inter-cultural relations ensure free flow of information and reciprocal socio-cultural influence between the two partners. In its most focused utility, the USâSouth Korea alliance serves principally to deter North Korea from attack against the South, or other destabilizing actions on/around the Korean Peninsula. Along with the USâJapan alliance, it also serves as a potential check on Chinaâs rising power in Northeast Asia, which naturally exposes South Korea to additional risk of coercion from China (South Koreaâs largest trading partner).
A clear example of this was Beijingâs incessant pressure on Seoul following the latterâs decision to permit installation of a US THAAD (Terminal High Altitude Area Defense) missile defense battery on South Korean territory. As retaliation for Seoulâs acceptance of THAAD installation, Beijing imposed informal economic sanctions (covering everything from impor...