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Congressional Research Service
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February 1, 2024


Yemen: Conflict, Maritime Attacks, and U.S. Policy


Yemen  is a conflict-afflicted nation along the strategic Bab
al Mandab Strait, one of the world's most active shipping
lanes. Since 2015, a civil war has pitted the Iran-backed
Houthi movement  against Yemen's internationally
recognized government, its backers, and other anti-Houthi
forces. Foreign intervention complicates the conflict, which
has contributed to what United Nations agencies have
described as one of the largest humanitarian crises in the
world. An uneasy truce has frozen conflict lines since
2022 (Figure 1). Houthi attacks on international shipping
have drawn major international attention back to Yemen
since October 2023, and have prompted U.S.-led coalition
counterstrikes. In December 2023, President Joe Biden
notified Congress that a small number of U.S. forces
pursue counterterrorism missions in Yemen.
Overview and Key Stakeholders
Long-running Yemeni  disputes over governance and energy
resources have deepened since 2015 amid foreign influence
and intervention. The Republic of Yemen was formed by a
1990 merger of the Sana'a-led Yemen Arab Republic (a
former Ottoman province, then Zaydi Shia-ruled kingdom)
and the Aden-led People's Democratic Republic of Yemen
(a former British colony and protectorate, then independent
Marxist regime). North-south tensions and conflict have
recurred since the 1960s, and a southern independence
movement  remains active. Tribal networks and local actors
are the most influential parties in many areas of the country.
Arab Spring-era protests and unrest led the president of the
Republic of Yemen  Government  (ROYG)   in 2012 to


resign. A U.N.-mediated transition and national dialogue
sought to broker new governing arrangements. The Houthi
movement   (alt. Ansar Allah or Partisans of God), a north
Yemen-based  Zaydi Shia network, opposed U.N.-backed
outcomes and resumed the insurgent posture they had taken
in previous rounds of fighting with the ROYG. In 2014, the
Houthis seized the capital, Sana'a, and later advanced on
Aden. ROYG   leaders fled and requested international
intervention. In March 2015, a coalition led by Saudi
Arabia began a military campaign against the Houthis,
whose attacks across Yemen's borders grew in complexity
and scope with deepening support over time from Iran. The
United States has provided logistical, intelligence, and
advisory support to the coalition, but ended aerial refueling
and limited arms sales to Saudi Arabia in response to
civilian casualties and congressional action.
In 2019, tensions among anti-Houthi forces in the ROYG
(backed by Saudi Arabia) and the separatist Southern
Transitional Council (STC, backed by the United Arab
Emirates) led to open warfare. A 2020 power-sharing
agreement formed a coalition government. Since 2022, an
eight-person Presidential Leadership Council (PLC) has led
Yemen's  internationally recognized government. That year,
the ROYG  and Houthis signed a truce, halting military
operations and establishing humanitarian measures. Lines
of conflict, in some areas mirroring Yemen's pre-
unification borders, remain frozen (Figure 1). Meanwhile,
Al Qaeda  in the Arabian Peninsula (AQAP) and the
Islamic State have remained active in remote areas.


Figure 1. Yemen:  Key Actors and Approximate   Areas of Influence
As of January 2024





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Source: CRS using ESRI and U.S. Department of State map data. Areas of Influence based on ACAPS data and U.N. and media reports.
Notes: STC - Southern Transitional Council. AQAP - Al Qaeda in the Arabian Peninsula. All areas approximate and subject to change. Shading
includes lightly populated and uninhabited areas.

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