Yemeni Civil War

The Yemeni Civil War escalated in 2014 when the Houthi movement took control of Sana'a and forced President Abdrabbuh Mansur Hadi's government from the capital. The Houthis, also known as Ansar Allah, emerged from northern Yemen and had fought several rounds of conflict with the state. Their seizure of the capital followed a political transition that had failed to resolve disputes over power, representation and economic conditions.

In March 2015, a coalition led by Saudi Arabia intervened at the government's request, seeking to restore Hadi's authority and prevent a Houthi advance. The war became an internationalized conflict involving Yemen's government, Houthi forces, southern separatists, al-Qaeda in the Arabian Peninsula, the Islamic State and foreign states. Front lines shifted, while air strikes, shelling and ground combat devastated civilian areas.

The war caused mass displacement, hunger, disease outbreaks and widespread damage to infrastructure. A United Nations-brokered truce in 2022 substantially reduced cross-border attacks and large-scale fighting, but it did not end the conflict. Yemen remained divided among rival authorities, and negotiations over a durable settlement continued amid economic crisis and regional tensions.

Historical context

Yemen's modern political history includes the former northern Yemen Arab Republic and southern People's Democratic Republic of Yemen, which unified in 1990. Political power remained concentrated under President Ali Abdullah Saleh. Southern leaders and residents later objected to marginalization and unequal distribution of resources. Houthi supporters in the north also resisted central authority and fought government forces in several wars between 2004 and 2010.

The 2011 Arab Spring protests led Saleh to transfer power to his vice president, Hadi, under a Gulf Cooperation Council initiative. A National Dialogue Conference sought to define a new political order, but disagreements over federal regions, power-sharing and security remained unresolved. The transition faced economic hardship, corruption and weak state institutions. Hadi's government struggled to build broad support and control armed groups.

The Houthis opposed the proposed federal map and argued that their region would be economically disadvantaged. They formed an alliance with Saleh and military units loyal to him, despite their prior wars. The alliance helped the movement expand beyond its stronghold in Saada and enter Sana'a in September 2014. Hadi remained president under pressure but fled the capital as Houthi forces consolidated control.

The Houthis

The Houthi movement developed from a revivalist Zaydi Shia current in northern Yemen, led by members of the Houthi family. It fought the Saleh government in six conflicts from 2004 to 2010. The movement portrayed itself as resisting corruption, foreign interference and political exclusion. It built an armed organization and local support networks, while opponents accused it of coercive rule and imposing its authority through force.

After taking Sana'a, the Houthis expanded their control over state institutions and military assets. They placed Hadi under pressure and later advanced south. In 2015, Hadi escaped to Aden and requested foreign intervention. The Houthis described their campaign as a revolution against corrupt elites; the internationally recognized government and coalition called it a coup and an Iranian-backed expansion.

Iran provided political support and, according to United Nations and other investigations, material assistance including weapons components and technical help. The extent and timing of Iranian support have been debated, particularly for earlier phases. The Houthis developed missiles and unmanned aerial systems capable of striking Saudi territory and maritime targets. The movement has also remained rooted in local Yemeni politics and military networks.

Course of the conflict

Seizure of Sana'a and government collapse

Houthi forces entered Sana'a in September 2014 after demonstrations and clashes. They took government buildings and military sites, while the government signed an agreement intended to reduce tensions and establish a more inclusive administration. The arrangement failed to restore effective authority. In January 2015, the Houthis placed Hadi and members of his cabinet under house arrest, and Hadi later resigned before escaping to Aden.

The Houthis advanced toward Aden in March 2015. Hadi appealed to the international community and left Yemen. The Security Council demanded that Houthi forces withdraw from areas seized by force. The rapid collapse of state authority increased fears among Gulf governments that the movement would dominate the Arabian Peninsula's southern border.

Saudi-led intervention and battles across Yemen

On 26 March 2015, Saudi Arabia announced a coalition air campaign, known as Operation Decisive Storm. The coalition included several Arab states and received logistical and intelligence support from the United States and other Western countries. It imposed restrictions on air and maritime access, citing the need to enforce an arms embargo. The intervention aimed to restore the recognized government and reverse Houthi advances.

Coalition air strikes targeted Houthi positions, military installations and supply routes. Human-rights organizations and United Nations experts documented attacks that killed civilians and damaged homes, markets, hospitals and infrastructure. Houthi forces also shelled civilian areas and launched missiles toward Saudi Arabia. Both sides were accused of violations of international humanitarian law. The fighting displaced millions and fractured local governance.

Government-aligned forces, southern separatists and local militias fought Houthi forces on multiple fronts. Aden changed hands during intense battles before government supporters and coalition forces regained control in July 2015. The southern city became a temporary seat of government, but separatist groups grew increasingly powerful and later clashed with government forces.

Al-Qaeda in the Arabian Peninsula exploited the security vacuum and seized territory in Hadramawt, including Mukalla, in 2015. The group faced operations by local forces and U.S. strikes. The Islamic State established a smaller presence and carried out bombings. These organizations fought the government and coalition but also attacked civilians and rival armed groups.

Regional escalation and fragmentation

Houthi forces fired ballistic missiles and later longer-range systems at Saudi cities, airports and energy facilities. Saudi Arabia intercepted many projectiles, though falling debris and successful strikes caused casualties and damage. Coalition aircraft conducted attacks in response. Cross-border exchanges transformed the war into a sustained security threat for both countries.

The partnership between the Houthis and Saleh collapsed in 2017. Saleh announced he was willing to turn against the movement and was killed by Houthi forces after fighting in Sana'a. The Houthis consolidated their control over the capital and much of the north. His death altered political alignments and removed a powerful network that had helped the movement expand.

In 2018, coalition-backed forces advanced toward the port city of Hodeidah, a critical route for food and aid imports. The United Nations brokered the Stockholm Agreement, which halted a major assault and established arrangements for a ceasefire and redeployment around the port. Implementation was incomplete, and disagreements over control and security persisted.

In 2019, the Southern Transitional Council, a separatist group seeking an independent south, seized Aden from government forces. Saudi Arabia mediated the Riyadh Agreement, which sought to share power and integrate security forces. The agreement was only partially implemented. Yemen's anti-Houthi camp remained divided over authority and the future political structure.

Truce and later developments

A United Nations-brokered truce took effect in April 2022. It halted most cross-border attacks, reduced air strikes and allowed limited commercial flights from Sana'a and fuel deliveries through Hodeidah. The truce expired in October, but the parties largely avoided a return to the previous level of large-scale fighting. Negotiations continued through Omani mediation and direct regional contacts.

The Houthis maintained control over Sana'a and large northern areas, while the internationally recognized government operated from Aden and other locations. The Presidential Leadership Council was formed in 2022 to unify anti-Houthi forces, but internal divisions persisted. The economy was split, with competing institutions and currencies, and public-sector salaries often went unpaid.

From late 2023, Houthi forces attacked commercial shipping in the Red Sea and Gulf of Aden, saying the campaign was connected to the Gaza war. The attacks disrupted international trade and prompted naval operations by the United States, Britain and other countries. These later events further internationalized the conflict and raised risks of renewed escalation.

Foreign involvement

Saudi Arabia led the coalition intervention and regarded Houthi control as a strategic threat on its southern border. The United Arab Emirates played a major role in air and ground operations and cultivated relationships with southern forces. Other coalition states contributed aircraft, ships or logistical support. Western countries provided arms, training, intelligence and maintenance to coalition members, a policy criticized because of civilian casualties and humanitarian effects.

Iran supported the Houthis and opposed the Saudi-led intervention. The movement's missile and drone capabilities raised concerns about arms transfers and technology sharing. Tehran denied directing Houthi operations, while Saudi Arabia and other governments described the movement as an Iranian proxy. Analysts have debated the extent of command relationships, but the movement retained independent domestic objectives and leadership.

The United States conducted counterterrorism operations against al-Qaeda in the Arabian Peninsula and supported coalition logistics. U.S. administrations later restricted or ended some forms of support, while continuing maritime defense and counterterrorism activity. Britain and France also faced scrutiny over arms exports. The United Nations imposed sanctions and established monitoring mechanisms, but its diplomatic efforts did not secure a comprehensive peace.

Humanitarian aspects of the war

Yemen's population faced severe food insecurity, disease and a collapse of public services. Conflict damaged ports, roads, hospitals, water systems and power networks. Import restrictions and fighting around key transport links disrupted supplies in a country dependent on imported food and fuel. Humanitarian agencies warned repeatedly that millions lacked reliable access to basic necessities.

A cholera outbreak beginning in 2016 became one of the world's largest recorded epidemics. Contaminated water and damaged sanitation systems allowed disease to spread rapidly. Health facilities lacked supplies, staff and fuel. Children were especially vulnerable to malnutrition and preventable illness.

The United Nations described Yemen as one of the world's worst humanitarian crises. Funding shortfalls and access restrictions limited relief. Aid organizations faced bureaucratic interference, insecurity and attacks. Both coalition and Houthi authorities were accused of impeding aid delivery, while fighting endangered humanitarian workers and displaced families.

Impact on citizens

Millions of Yemenis were displaced, with many forced to move multiple times. Families lost homes and livelihoods, and children missed years of school. Women and girls faced heightened risks of early marriage, exploitation and gender-based violence. People with disabilities and chronic illnesses struggled to obtain care as hospitals closed or became inaccessible.

Arbitrary detention, enforced disappearance, torture and recruitment of children were reported by human-rights organizations. Journalists and activists faced threats from multiple authorities. Public employees often went months without salaries, and restrictions on movement separated families and impeded access to education and medical treatment.

The conflict damaged social trust and divided communities along political, regional and sectarian lines. Yet local mediation and community networks continued to resolve disputes and organize relief. Yemenis themselves bore the largest costs of a war shaped in part by external powers.

United Nations response

The Security Council adopted resolutions demanding Houthi withdrawal and imposing an arms embargo on designated individuals and entities. A sanctions committee and expert panel monitored violations and reported on weapons transfers, civilian harm and obstruction of aid. The United Nations appointed special envoys to mediate between the parties.

Humanitarian agencies coordinated food, health and shelter programs. The World Food Programme, UNICEF, the World Health Organization and other organizations operated across difficult front lines. Security Council resolutions called for humanitarian access and protection of civilians, but enforcement remained limited.

Peace process

Negotiations included talks in Kuwait in 2016, the Stockholm Agreement in 2018 and the 2022 truce. Discussions addressed political transition, security arrangements, prisoner exchanges, access to ports and payment of salaries. The parties disagreed over sequencing and recognition: the government demanded Houthi withdrawal and disarmament, while the Houthis sought guarantees and a broader power-sharing settlement.

Saudi Arabia and Oman engaged in direct contacts with the Houthis, and the United Nations sought to convert the truce into a nationwide ceasefire and political process. Progress depended on regional de-escalation and agreement among Yemen's fragmented factions. Local ceasefires sometimes held even when national negotiations stalled.

A durable settlement would need to address state structure, southern demands, security integration, economic governance and accountability. The conflict's many armed groups and external relationships make implementation difficult. The reduction in fighting created an opportunity for negotiations but did not itself resolve the causes of war.

Environmental impact

Air strikes and ground fighting damaged farms, water systems and industrial sites. Fuel shortages and the breakdown of waste management increased health and environmental risks. Land mines and unexploded ordnance contaminated farmland and roads, killing and injuring civilians after battles ended.

The deteriorating FSO Safer oil tanker off Yemen's Red Sea coast became a major environmental concern. A large spill could threaten fisheries, coastal communities and shipping. United Nations-led efforts transferred oil from the vessel to avert an imminent disaster, though long-term monitoring and safe disposal remained necessary.

Climate pressures, including drought and water scarcity, compounded the impact of conflict. Yemen's limited resources and weak institutions made recovery harder. Environmental damage affected livelihoods and could deepen competition over land and water even after ceasefires.