Yemen War: Civil Conflict & Regional Security Impact
Quick Answer: What is the Yemen war?
The Yemen war is a multi-sided civil conflict that began in 2014 when Houthi forces captured the capital Sanaa. It escalated into a regional proxy war involving a Saudi-led coalition and Iranian support for the Houthis. The UN Development Programme estimated in its 2021 assessment that some 377,000 people had died from direct violence and war-related causes, and the conflict has created the world's worst humanitarian crisis, with millions facing famine conditions.
Overview
Yemen's civil war is one of the longest-running and most devastating conflicts of the 21st century. What began as a political crisis following the 2011 Arab Spring protests has evolved into a complex, multi-front war involving domestic factions, regional powers, and international actors. The conflict has fractured Yemen into competing zones of control, with the Houthi movement (Ansar Allah) holding the capital Sanaa and much of the north, while the internationally recognized government and various southern factions control other areas.
The war has produced catastrophic humanitarian consequences, with the UN designating it the world's worst humanitarian crisis for multiple consecutive years. Beyond Yemen's borders, the conflict has become a defining theater in the broader Saudi-Iranian rivalry, a source of maritime insecurity in the Red Sea and Gulf of Aden, and a factor in global energy security calculations. For the latest on Houthi Red Sea operations, see the dedicated Houthi Attacks Tracker and Red Sea Attacks Tracker.
This page covers the broader civil war - its origins, key actors, peace efforts, and humanitarian toll - providing context for the regional instability that has made Yemen a persistent concern for U.S. Central Command and global security planners.
Civil War Background
Yemen's current conflict has roots in the failed political transition following the 2011 uprising that forced longtime President Ali Abdullah Saleh from power. His successor, Abdrabbuh Mansur Hadi, inherited a country beset by tribal divisions, a southern secessionist movement, an al-Qaeda insurgency, and an economy in freefall. The Gulf Cooperation Council (GCC) brokered a transition deal, but the National Dialogue Conference that was meant to forge a new political settlement ultimately failed to accommodate all factions.
The Houthi movement, rooted in the Zaidi Shia community of northern Yemen, had been fighting a series of wars against the central government since 2004. Taking advantage of the political vacuum and widespread frustration with the Hadi government, Houthi forces swept south from their stronghold in Saada province, capturing Sanaa in September 2014. By early 2015, the Houthis had forced Hadi to flee to Aden and then to Saudi Arabia, effectively dissolving the legitimate government's authority over most of the population.
The Houthi advance prompted Saudi Arabia to intervene in March 2015, assembling a coalition of Arab states to restore Hadi's government. The coalition launched an air campaign and naval blockade that would become the dominant military feature of the war. The conflict quickly fragmented further: southern separatists formed the Southern Transitional Council (STC), al-Qaeda in the Arabian Peninsula (AQAP) exploited the chaos to seize territory, and former president Saleh briefly allied with the Houthis before they killed him in December 2017.
Houthi Control & Saudi Coalition
The Houthi movement controls Sanaa, the major Red Sea port of Hodeidah, and most of Yemen's densely populated northwestern highlands - an area home to roughly 70% of Yemen's pre-war population. The Houthis have built a functioning, if authoritarian, governance structure with ministries, tax collection, a central bank, and security forces. They have also developed a significant military-industrial capability, producing and deploying drones, ballistic missiles, and anti-ship weapons that have been used to strike targets in Saudi Arabia, the UAE, and international shipping.
The Saudi-led coalition, which at various points included the UAE, Bahrain, Kuwait, Egypt, Sudan, and others, conducted thousands of airstrikes targeting Houthi military positions, infrastructure, and - controversially - civilian sites including hospitals, schools, weddings, and markets. The coalition imposed a naval and air blockade that severely restricted imports of food, fuel, and medicine into Houthi-held areas. The UAE effectively withdrew from the coalition in 2019 but maintained influence through proxy forces in southern Yemen, particularly the STC and the Giants Brigades.
The internationally recognized government, now represented by the Presidential Leadership Council (PLC) formed in 2022, controls parts of southern and eastern Yemen, including the temporary capital of Aden, the oil-producing regions of Marib and Shabwa, and the eastern province of Hadramawt. However, the PLC is a fragile coalition of competing factions - including the STC, which openly seeks southern independence - and exercises limited actual governance over the territories nominally under its authority.
Iran's Role
Iran's support for the Houthi movement has been one of the most consequential external factors in the Yemen war. While the Houthis are not Iranian proxies in the direct sense - they have their own domestic grievances and independent decision-making - Iran has provided significant military assistance including weapons, components, training, and advisory support. U.S. and UN investigations have documented Iranian-origin missiles, drone technology, and naval mines in Houthi arsenals, with components often smuggled by sea.
Iran's strategic interest in Yemen is primarily as a pressure point against Saudi Arabia and as part of its broader "Axis of Resistance" network that includes Hezbollah in Lebanon, militias in Iraq, and Hamas and Palestinian Islamic Jihad. The Houthis' ability to threaten Saudi cities with missiles and drones, disrupt Red Sea shipping, and tie down Saudi military resources serves Iran's regional strategy at relatively low cost. The Houthis have increasingly coordinated their operations with other Iranian-aligned groups, most during the Israel-Hamas war that began in October 2023.
The Saudi-Iranian diplomatic normalization agreement brokered by China in March 2023 created space for Yemen peace talks, as both regional powers signaled willingness to de-escalate. However, the extent to which Iran can or will restrain Houthi military operations - particularly their Red Sea attacks on commercial shipping - remains a central question. The Houthis have demonstrated a degree of operational autonomy that suggests Iranian influence has limits, even as the military partnership deepens.
Ceasefire & Peace Efforts
Yemen has experienced several ceasefire attempts, the most significant being the UN-brokered truce that took effect in April 2022. The truce halted major military operations, reopened Sanaa airport to limited commercial flights, and allowed fuel ships to enter Hodeidah port. While the truce formally expired in October 2022, its core provisions have largely held through an informal cessation of hostilities, with neither side resuming large-scale offensive operations on the ground or in the air.
Saudi Arabia and the Houthis engaged in direct negotiations through Omani mediation starting in 2023, building on the momentum from the Saudi-Iranian normalization deal. These talks focused on a permanent ceasefire, the payment of civil servant salaries in Houthi-held areas using oil revenues, and the reopening of roads and ports. However, the talks stalled repeatedly over governance arrangements - the Houthis demand recognition as the legitimate government of all Yemen, while the PLC insists on a power-sharing framework.
The outbreak of Houthi attacks on Red Sea shipping in late 2023, in response to the Israel-Hamas war, significantly complicated peace prospects. U.S. and UK military strikes against Houthi targets in Yemen starting in January 2024 introduced a new external military dimension to the conflict. Saudi Arabia, which had been moving toward a settlement, found itself in an awkward position - publicly opposing the Houthi Red Sea campaign while also distancing itself from the U.S.-UK strikes. The peace process remains active but fragile, with the Red Sea dimension adding complexity to an already difficult negotiation.
Humanitarian Crisis
The humanitarian toll of the Yemen war is staggering. The UN Development Programme estimated in its 2021 assessment that some 377,000 people had died from direct violence and war-related causes including disease, malnutrition, and lack of medical care; no updated UN-wide toll has since been published. Over 22 million Yemenis - roughly half the population - require humanitarian assistance, with 18.3 million acutely food insecure, according to the UN Office for the Coordination of Humanitarian Affairs. The war has displaced approximately 4.5 million people internally, and Yemen's healthcare, education, and water infrastructure has been devastated by a decade of conflict.
Food insecurity is the most acute humanitarian concern. Yemen imports approximately 90% of its food and fuel, making it extremely vulnerable to the coalition's blockade restrictions and global commodity price fluctuations. At various points during the conflict, the UN has warned that parts of Yemen face famine conditions - classified as IPC Phase 5, the most severe level of food insecurity. Cholera outbreaks have affected over 2.5 million people since 2016, representing one of the largest cholera epidemics in modern history.
Humanitarian funding for Yemen has declined sharply even as needs have grown. The UN's humanitarian response plan has been consistently underfunded, with agencies forced to cut food rations, close health facilities, and scale back programs. The economic collapse - Yemen's currency has lost most of its value, and the economy has been split between rival central banks in Sanaa and Aden - means that even Yemenis not directly affected by fighting struggle to afford basic necessities. The war has set Yemen's development back by decades, and recovery will require sustained international support long after any peace agreement.
Frequently Asked Questions
What started the Yemen war?
The current conflict began when Houthi forces, a Zaidi Shia movement from northern Yemen, captured the capital Sanaa in September 2014 amid political instability following the 2011 Arab Spring. Saudi Arabia intervened in March 2015 with an air campaign and coalition to restore the internationally recognized government, escalating the conflict into a full-scale regional war.
Who are the Houthis?
The Houthis, formally known as Ansar Allah, are a Zaidi Shia political and military movement originating in northern Yemen's Saada province. Founded in the 1990s as a religious revivalist movement, they fought six wars against Yemen's central government between 2004 and 2010 before seizing power in 2014. They control Sanaa and most of northwestern Yemen, governing a population of roughly 20 million.
Is there a ceasefire in Yemen?
While no formal ceasefire is in effect, a de facto cessation of major hostilities has held since the UN-brokered truce of April 2022. Saudi Arabia and the Houthis have been engaged in peace negotiations mediated by Oman. However, the Houthi campaign against Red Sea shipping starting in late 2023, and subsequent U.S.-UK military strikes on Houthi targets, have complicated the peace process.