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South Korea: Background and U.S. Relations

Overview
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 South Korea. The economic
relationship is bolstered by the U.S.-South Korea Free Trade
Agreement (KORUS FTA), implemented in 2012. In 2023,
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.-ROK trade and investment flows.
ROK 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. 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 the prime minister of Japan at
Camp David, the three countries' first-ever standalone
summit meeting. The leaders announced a set of
unprecedented initiatives for trilateral consultation and
collaboration. In 2024, the three countries have deepened
and expanded their cooperation.
North Korea Policy Coordination
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 then-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.) The two allies also 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. 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. North Korean leader Kim Jong-un also has
boosted relations with both 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.
In August 2024, Yoon announced a new vision of Korean
reunification, saying he envisions a unified Republic of
Korea, a goal some observers interpreted as entailing South
Korea's absorption of North Korea. Subsequently, Yoon's
Unification Minister clarified that the goal is not unification
of the Korean Peninsula through force, but instead a
gradual and peaceful unification. The new approach
promises a more concerted push to improve human rights in
North Korea, including increasing the North Korean
people's access to information about the outside world and
the Kim regime.

https://crsreports.conqress.qov

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