Yemen's President Rashad al-Alimi announced the start of military operations to retake all Houthi-held territory and extend state authority across the country, marking a transition from the exchange of airstrikes into a declared comprehensive military campaign [5][7][8][17]. The announcement came hours after Houthi forces cut the Taiz-Aden supply route and encircled Taiz, with more than 70 people killed in a day of fighting [7][10][21]. Houthi military spokesman Yahya Saree simultaneously claimed ballistic missile and drone strikes on Saudi Aramco facilities in Riyadh and the Khurais area, saying both operations hit their targets and caused large fires [1][2][4][26].
Al-Alimi, in a televised address, said: "Today, I announce the start of military operations to retake the remaining territory of the republic and extend the authority of the state and its institutions across the entire national territory" [5][7][8]. He directed all military formations to execute approved plans until the country is liberated from what he called the "terrorist Houthi militia," thanked Saudi Arabia for its support, and called on regional and international allies to back the effort [9][13][17]. The Saudi-led coalition pledged full operational support to the Yemeni armed forces to end the Houthi coup and restore state institutions [12][23].
Saree framed the Aramco strikes as retaliation for what he said were Saudi air and missile strikes on Sanaa and other provinces, with his statements giving varying tallies — 60 strikes in 24 hours and a total of 1,410 since the escalation began in one version [3], 60 strikes in 24 hours with a total of 1,420 in another [4], and 50 strikes in 12 hours raising his stated total to 1,460 in a later statement [19][26]. He warned the group would answer "blockade with blockade, and escalation with escalation" and vowed continued attacks on Saudi military and energy sites until what he called the aggression ends and the blockade on Yemen is lifted [4][19][26]. An AFP journalist saw flames and smoke rising from an Aramco refinery south of Riyadh, with firefighters and ambulances at the scene [24][25][33].
Saudi-led coalition spokesman Turki al-Maliki dismissed the Houthi claims of targeting Riyadh as "misleading," saying the group was searching for illusory victories to divert attention from its human losses in Taiz and growing public anger [2][30][31]. Al-Maliki accused the Houthis of imposing blockades, forcibly displacing civilians, looting resources, and recruiting children, and asserted the Kingdom's right to defend its sovereignty [12][23]. Saudi authorities had no immediate comment on the Aramco facility fire [25][29].
Competing battlefield accounts offered different figures. Yemeni government forces spokesman Colonel Majed Abdullah al-Nazili announced 257 precision targeting operations against Houthi sites, stating at least 700 Houthi fighters were neutralized [3][30]. The coalition reported 97 precision targeting operations on the Tor al-Baha front and Taiz axis [2][30], while Yemen's internationally recognised government stated 1,540 Houthi fighters were killed or wounded in 24 hours across 474 operations [27]. The Houthis reported 55 of their fighters killed in Taiz [25].
Analysts questioned the credibility of the announced offensive. Chatham House research fellow Farea Al-Muslimi said the Houthis had already achieved the military objective of isolating Taiz from Aden without fully taking the city, and called the coming government offensive "meaningless" [5][7][8][21]. Political science researcher Sébastien Boussois said he did not see how the Yemeni president could lead a major offensive when Saudi Arabia struggles to secure its own pipeline and the Americans seem undetermined to help, describing the announcement as "practically a call for help from a president who controls little" [16].
UN agencies and rights organizations warned of a humanitarian catastrophe. The World Food Programme warned that three-quarters of Yemen's population cannot meet basic food needs and that the hunger crisis threatens to become "absolutely devastating" [8][9][25][28][33]. UN Special Envoy Hans Grundberg expressed alarm over the fighting in Taiz governorate, particularly road closures preventing residents from fleeing [16]. The International Organization for Migration registered 129,438 displaced persons as of 21 September, and UNICEF reported more than 137,000 school-age children faced disruption to education [41]. The SAM Organization for Rights and Freedoms documented at least 16 civilian deaths and about 18 injuries, calling for independent investigations [41].
The fighting threatened Red Sea shipping and global energy supplies. The United Kingdom Maritime Trade Operations agency reported multiple explosions near a tanker about 60 nautical miles south of Mocha near the Bab al-Mandeb strait [11][38]. Analyst Martin Kelly warned that Houthi target-selection criteria have previously tended to broaden during active fighting [38], while oil and Iran analyst Gregory Brough said strikes on the Yanbu terminal or the East-West pipeline could substantially increase supply shortfalls [46]. OPEC reported that Riyadh reduced its oil production by 23% in August [9].
Washington limited its role to intelligence and targeting support while rebuffing Saudi requests for direct military involvement. President Donald Trump came close to ordering a strike on the Houthis after a Saudi request in late September but held off [36], and has so far rebuffed Riyadh's reported request for help [24][25]. US Central Command declined to comment on the US advisory and targeting support [36]. Trump's cabinet met at Camp David to discuss next steps on the Iran and Yemen files [28][43].
Regional powers convened an emergency meeting under the Makkah Defence Alliance [22]. Pakistani Deputy Prime Minister Ishaq Dar said an emergency meeting of the pact's strategic committee in Riyadh would focus on the Houthi attacks on Saudi Arabia [22][47]. Pakistani Defense Minister Khawaja Asif said the defense pact would be activated if unprovoked aggression continues [47], while Prime Minister Shehbaz Sharif told the UN General Assembly the world must choose the path of peace [47]. Iran's Foreign Minister Abbas Araghchi said there is no military solution to the conflict with the US while warning that Tehran remains ready to defend itself [18].
Local Yemeni communities mobilized independently of the central government's campaign. Taiz resident Zakaria Al-Dhubhani vowed that residents would resist any Houthi advance: "We will defeat and crush anyone who enters the city of Taiz. We will not abandon Taiz" [7][8][21]. The Southern Transitional Council announced general popular mobilization to defend the south and its political project, planning mass rallies in Aden and southern governorates [42].
The offensive's launch coincided with the emergency Riyadh meeting of the Makkah pact's strategic committee, attended by Pakistani and Turkish officials [22]. The Houthis maintained their naval blockade on Saudi shipping in the Red Sea [25], and UN envoy Grundberg's alarm over closed routes trapping displaced residents in Taiz remained unresolved [16].