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Updated June 25, 2024

South Korea: Background and U.S. Relations

Overyew
South Korea (officially the Republic of Korea, or ROK) is
one of the United States' most important strategic and
economic partners in Asia. The U.S.-ROK Mutual Defense
Treaty, signed in 1953 at the end of the Korean War,
commits the United States to help South Korea defend itself,
particularly from North Korea (officially the Democratic
People's Republic of Korea, or DPRK). Approximately
28,500 U.S. troops are based in the ROK. The economic
relationship is bolstered by the U.S.-South Korea Free Trade
Agreement (KORUS FTA), implemented in 2012. In 2022,
South Korea was the United States' seventh-largest trading
partner (goods and services trade combined), and the United
States was South Korea's second-largest trading partner,
behind the People's Republic of China (PRC, or China).
Over the past decade, congressional interest in U.S.-ROK
relations often has focused on U.S.-ROK cooperation on
North Korea, Indo-Pacific policies, the U.S.-ROK alliance,
and U.S.-South Korea trade and investment flows.
South Korean President Yoon Suk-yeol, in office since May
2022, is seeking to transform South Korea into a global
pivotal state by raising its profile beyond the Korean
Peninsula and becoming a more active U.S. partner in the
Indo-Pacific. U.S. President Joseph Biden and Yoon have
forged closer cooperation on North Korea policy, including
through bilateral and trilateral (with Japan) military
exercises. They also have committed to strengthening
economic security in line with U.S. efforts to promote
technological development and supply chain resiliency.
The increased U.S.-ROK alignment was on display during
April 2023, when Biden hosted Yoon for a State Visit and
Yoon spoke to a Joint Meeting of Congress. To address
increased South Korean concerns about the credibility of the
U.S. commitment to ROK security, Biden and Yoon issued
the Washington Declaration on extended deterrence. In
the document, the United States agreed to expand
consultations with South Korea on the use of U.S. nuclear
weapons on the Korean Peninsula and to enhance the
regular visibility of strategic assets, including nuclear-
capable weapons systems deployed to the Peninsula. South
Korea restated its commitment not to develop nuclear
weapons. Since the late 2010s, as North Korea has advanced
its nuclear and missile capabilities, opinion polls have
shown the ROK public supports developing indigenous
nuclear weapons. In August 2023, Biden hosted Yoon and
Japanese Prime Minister Kishida Fumio at Camp David, the
three countries' first-ever standalone summit meeting. The
leaders announced a set of unprecedented initiatives for
trilateral consultation and collaboration.
North     orea Pocy Coord nat ion
Historically, North Korea has been the dominant strategic
concern in the U.S.-ROK relationship. Whereas the previous
ROK government emphasized diplomacy with North Korea,

Yoon and Biden have emphasized deterrence. They have
reactivated high-level consultations on extended deterrence
under the U.S. nuclear umbrella and expanded the scope and
scale of combined military exercises (including with Japan),
which President Donald Trump and Yoon's predecessor had
curtailed. The United States has increased deployments of
strategic assets-such as nuclear-armed submarines-to
South Korea, introduced new unilateral sanctions
designations on North Korea, and proposed new DPRK
sanctions measures in the United Nations. (China and
Russia vetoed the attempt.)
Alongside these steps, the two allies have offered
Pyongyang unconditional humanitarian assistance, and
Yoon has pledged large-scale economic assistance if North
Korea embarks on a genuine and substantive process for
denuclearization. Biden Administration officials say they
have reached out to North Korea, offering to meet without
preconditions. Pyongyang largely has ignored U.S. and
South Korean outreach. If negotiations restart, the
Administration appears to envision offering some sanctions
relief in exchange for steps toward denuclearization.
Tensions on the Korean Peninsula have increased since
2021. In the ensuing period, North Korea has test-launched
more than 80 missiles, including multiple tests of
intercontinental ballistic missiles (ICBMs), which are
capable of delivering nuclear warheads. Analysts are
concerned that North Korea may conduct its seventh nuclear
weapons test, which would be the first since September
2017. Kim has pledged to exponentially increase North
Korea's nuclear weapons stockpile and said he will never
denuclearize. In 2023, North Korea declared that South
Korea is a hostile state rather than one inhabited by
fellow countrymen, and in 2024, warned of possible
military actions in the waters surrounding the Korean
Peninsula. Since 2022, Kim also has boosted relations with
Russia and China, including forging a new strategic
partnership with Moscow that includes a mutual defense
pledge in the event either country is attacked. Analysts
worry that possible Russian transfers of advanced military
technology, in addition to China's increased economic and
diplomatic support, could boost North Korea's military
capabilities and embolden Kim to conduct aggressive
diplomatic, military, or other actions.
U.S.-South Korea Security Issues
The Biden Administration has worked to repair and expand
the alliance, which had been strained under Trump,
prompting the 115th and 116th Congresses to impose
conditions (via National Defense Authorization Acts) on the
President's power to withdraw U.S. troops from South
Korea. In 2021, the Biden Administration concluded a cost-
sharing negotiation with South Korea-an earlier agreement
had expired in 2019-that boosted South Korea's
contribution to alliance costs by 13.9%. The ROK

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