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    December 10, 2019


U.S.-South Korea Alliance: Issues for Congress


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South Korea (officially the Republic of Korea, or ROK) is
considered 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). South Korean troops have fought in U.S.-led
conflicts, including in Vietnam, Iraq, and Afghanistan. The
United States includes South Korea under its nuclear
umbrella, otherwise known as extended deterrence.

The U.S. military has maintained a large troop presence in
South Korea since the end of the Korean War. Currently,
approximately 28,500 U.S. troops are based in the ROK,
predominately Army personnel. Camp Humphreys, which
will host most of the troops when completed, is the largest
U.S. overseas military base in the world.

The U.S.-ROK alliance is strained on several fronts.
President Trump's periodic references to bringing U.S.
troops home from the Peninsula and his criticism of the
value of alliances more broadly have raised questions in
Seoul about U.S. security commitments. Contentious
burden-sharing negotiations face a December 31, 2019,
deadline, just as North Korea threatens to return to
provocations. South Korean President Moon Jae-in wants to
complete the long-delayed process to transfer operational
control of ROK forces in wartime to a South Korean
general, which could lead to disagreements about the timing
and conditions for the transition. In addition, growing
differences in approach to dealing with North Korea and
China could put increased pressure on the alliance.

Th*\anse  W t.RK Poky
The threat from North Korea has framed the alliance since
its formation. For years, the two militaries conducted
regular bilateral exercises, enhancing their capability as a
joint force in the event of the resumption of hostilities with
the North. Under President Moon and President Trump both
governments have pursued diplomacy with Pyongyang and
the alliance has adjusted its activities. For example, at a
summit with North Korean Leader Kim Jong-un in
Singapore in June 2018, President Trump called for a
cancellation of large-scale military exercises, declaring
them very expensive and provocative. With the
resumption of smaller, less public exercises in 2019, U.S.
military officials assert that the alliance has maintained
readiness, but some analysts warn that the reduction in joint
exercises could damage alliance cohesion.

In 2018, South Korea and North Korea signed a tension-
reduction agreement known as the Comprehensive Military


Agreement (CMA). The CMA establishes land, sea, and air
buffer zones in the heavily armed Demilitarized Zone
(DMZ) that separates the two Koreas and around the
maritime border, called the Northern Limit Line.
Implementation of the CMA required U.S. military officials
to modify practices in the DMZ, including removing land
mines and guard posts. While observers point to a marked
reduction of tension in the DMZ, some critics maintain that
the CMA-mandated changes reduced alliance readiness
with little sacrifice in return from North Korea.

Figure I. U.S. Forces Korea (USFK) Bases
   . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... .... .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .





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between.Washington.and.Seoul.on.how.much.South.Korea
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the::peninsula.:These:negotiations.on.cost-sharing
arrangements  known as    ..the.Special.Measures
Agreement or SMA    generally..occur.every.five.years.
The:cu::ent:talksaim to.renew.theaccord signed......
February 2019       ..that.raised.South.Korea's.previous.annual
con~trib~utio...baproimtel.    Pressreports indicate::::.:.
that the Trump Administration now is.. asking.South.Korea


















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