Iraq's security forces seized a drone-launching platform in Maysan province linked to the strike on Saudi Arabia's East-West pipeline, and Baghdad closed border crossings with Iran under what it called "preventive sovereignty" — a stance that Iraqi territory will not serve as a launching pad for attacks on neighbours or as a theatre of proxy war [37][38]. The Iraqi army found drone launch pads in the remote al-Tib area of Missan province and closed the al-Shalamja and al-Shaib crossings with Iran [21]. Separately, a Wall Street Journal report relayed by outlets in Singapore, France and China cited unnamed US officials linking high-resolution Chinese commercial satellite imagery of Jordan's Muwaffaq Salti base to the July missile strike that killed three American soldiers [39][43][44].

Iraqi Prime Minister Ali al-Zaidi ordered the formation of an investigative council into the Maysan Operations Command and dismissed its commander after confirming the drone attack on the Saudi pipeline originated from that province [24][37]. Saad Maan, head of Iraq's Security Media Cell, said Iraq adopts the principle of "preventive sovereignty," meaning not only preventing attacks on Iraqi territory but also not allowing Iraqi land to be a launching pad against any other country or part of a proxy war [37][38]. The pro-Iranian Islamic Resistance in Iraq denied involvement in the drone attack and declared readiness to cooperate with the investigation [21]. Iraqi Foreign Minister Fuad Hussein and Saudi Foreign Minister Prince Faisal bin Farhan spoke by phone and stressed continued Baghdad-Riyadh coordination for regional security [24].

Saudi Arabia said it would not respond immediately to the pipeline attack at Baghdad's request while reserving the right to take all necessary measures to protect its sovereignty [10][11][21]. The Saudi foreign ministry said the drones caused human injuries and damage to the 1,200-kilometre East-West pipeline, which has a capacity reported as 4 to 5 million barrels per day [2] or about 7 million barrels per day [24], and serves as a bypass route for Saudi oil now that the Strait of Hormuz is effectively blocked [2][10]. The Gulf Cooperation Council condemned the attack as "a dangerous escalation" and an unacceptable threat to Saudi territory and strategic infrastructure, with Secretary General Jasem Albudaiwi urging Iraq to strengthen measures so its territory cannot be used to launch such operations [32].

The Wall Street Journal report on Chinese satellite imagery, relayed by Euronews Persian and Chinese outlet NetEase, said unnamed US officials linked the imagery to Iran's July 17 strike on the Muwaffaq Salti Air Base [43][44]. Former CIA analyst Jim Lamson said fresh high-resolution imagery from Chinese sources can reveal the latest base changes and help Iran select the most effective targets at the right time [43][44]. The report noted the matter could resurface at the September 24 Trump-Xi meeting [39]. China's Foreign Ministry rejected attempts by "certain entities" to tie Beijing to the war, criticised parties for maliciously linking and smearing other countries, and stated China's firm opposition to illegal unilateral sanctions imposed without international law or UN Security Council authorisation [43][44]. US Secretary of State Marco Rubio declined to answer directly whether China provides targeting intelligence to Iran, saying no Chinese action has changed the trajectory of the conflict [43].

The Houthi movement frames its missile and drone strikes on Saudi bases and its coastal offensive as precise and direct responses to Saudi aggression against Yemen. Houthi military spokesman Yahya Saree said the attacks on the Sharurah base targeted "weapons depots and command and control centres that are managing the aggression against our nation and people" [1][13][15]. The Houthis declared maritime navigation safe for all companies except Saudi vessels, which they said are subject to a blockade [25][26][30]. Houthi leader Abdul-Malik al-Houthi called the prior US-Houthi ceasefire "a huge defeat for the United States" [34]. Houthi information minister Mohammed Mansour said passage through Bab al-Mandeb is free for international shipping but forbidden for Saudi ships [36].

Yemen's internationally recognised government describes the Houthi advance as a violation of sovereignty. Yemeni government forces said their air force targeted "positions and barracks of the terrorist Houthi group" with airstrikes in Taiz [8][13]. The government information centre in Taiz said Yemeni government aircraft struck dozens of trucks transporting weapons and missiles on a convoy heading from Mokha to Sanaa [4]. Yemen's foreign ministry sent a letter to the UN Security Council president and secretary-general to draw attention to the Houthi seizure of western coastal areas [16].

Washington attributes the pipeline attack and regional escalation to Tehran, with President Donald Trump calling Iran "the world's number one sponsor of terror" [30][42]. Trump said Iran was "probably" responsible for the pipeline attack but declined Saudi Crown Prince Mohammed bin Salman's twice-repeated request for direct US strikes on the Houthis, offering intelligence and targeting support instead [6][13][25]. A senior Trump administration official said Washington is focused on protecting core national security interests such as ensuring freedom of navigation in the Red Sea while empowering regional partners to take the lead [6]. US Central Command said its forces have diverted 100 commercial vessels in the last 60 days under the naval blockade of Iranian ports [35].

Iran denies that the Houthis are its proxy or take military direction from it, even as it publicly welcomes their battlefield advances [16][20][30]. President Masoud Pezeshkian said the US terror-sponsor accusation comes from "the same devils" responsible for an earlier strike on a school [30]. Foreign Ministry spokesman Esmaeil Baghaei said the Strait of Hormuz "remains and will remain under Iran's full control" [33]. Iran confirmed its representatives will meet Iraqi and Gulf Arab counterparts in Oman to resume talks on safe commercial shipping routes [30].

Analysts describe the Houthi capture of Yemen's Red Sea coast as a strategic shift. Chatham House research fellow Farea al-Muslimi said Iran now controls two of the world's most strategic choke points covering more than 35 percent of global fuel and oil trade, calling it "as much leverage as a nuclear bomb" [7]. He also called the situation "a full-scale war" [9]. Israeli military expert Danny Citrinowicz said there has rarely been a strategic failure of this magnitude in the Middle East [36]. London School of Economics professor Fawaz Gerges said effective Houthi control over the Red Sea coast "is a game changer" [42]. Security expert Sergei Migdal said the Houthis are more independent allies than Iran's direct proxies but that Tehran likely prompted their threat to block Bab al-Mandeb [16].

The disruption is raising costs across global shipping, insurance and energy markets. The German Shipowners' Association warned that many shipping companies are avoiding the region and taking the longer route around the Cape of Good Hope [36]. War-risk premiums for southern Red Sea voyages have more than doubled, with some Saudi-linked ships quoted up to 3 percent of value [48]. A Gulf business outlet reported war-risk cover adding up to $8 to a barrel of oil [41]. S&P Global Energy said it expects international oil prices to remain elevated at $80 to $100 a barrel throughout next year [26]. Vietnamese exporters face doubled freight rates and emergency surcharges of $1,500-4,000 per container [47], and South Korea's Yonhap News warned of a "double blockade" hitting Korean exports and supply chains [50].

The UN migration agency reports that 76,000 people have fled the fighting since July, a figure that quadrupled in a week [8][13][35]. IOM Yemen chief Abdusattor Esoev said families are arriving "with nothing: no shelter, no food, no way to know if it's safe to go back" [9][51]. Human Rights Watch researcher Niku Jafarnia said that with nearly two-thirds of Yemen's population in need of aid, any additional displacement carries "a real civilian cost" [9]. Djibouti's economy minister Ilyas Moussa Dawaleh said about 1,400 refugees have arrived from Yemen [35]. One displaced resident of Mocha described being told by the Houthis: "Leave, scatter, you have half an hour" [8].

Pakistan declared "unwavering support" for Saudi Arabia but rejected joining offensive strikes on the Houthis, preserving its mediation role with Tehran [28][10]. BRICS countries issued a joint declaration urging "maximum restraint" [35]. Bahrain said it will take part in no collective meeting attended by Iran before diplomatic relations are restored [35]. Egypt formed a crisis cell to monitor the Houthi takeover of Bab al-Mandeb over fears Iran could order the strait's southern entrance closed, halting the Suez Canal [35].

Iraq approved an Iranian request to join the investigation into the drone launches, with Prime Minister al-Zaidi authorising a joint probe after launch platforms were found near the Iran-Iraq border [37][38]. The Trump-Xi meeting scheduled for September 24 may address the satellite-imagery allegation [39]. Saudi Arabia continues airstrikes on Houthi positions along Yemen's western coast while reserving the right to act against Iraq-based launch sites [4][10].