Yemen's internationally recognised government carried out nine air strikes against Houthi positions and military equipment in Taiz governorate on Tuesday — five in Dhubab district, four in al-Masrakh — marking a renewed ground and air campaign in the country's southwest. Fighting continues in al-Shaqab, south of Taiz, with no ceasefire in sight. The Yemeni Network for Rights and Freedom documented at least five civilian deaths, including a five-year-old girl, and 17 injuries from Houthi shelling of residential neighbourhoods over a 24-hour period. The group alleges more than 180 projectiles were fired across Taiz, damaging at least seven homes. The UN reports at least 46 civilians killed and over 130 injured nationwide since August, with more than 200,000 displaced since September. The internal fighting sits within a cascading regional escalation. In September, Houthis executed a lightning ground offensive on the port city of Mocha, seized territory along Yemen's western coast, and captured the strategically critical Mayyun Island in the Bab al-Mandeb strait — the chokepoint through which roughly 10% of global trade flows. The Houthis had previously declared a naval blockade of Saudi ports and Red Sea shipping in July. The Houthis have simultaneously projected force externally. At least 14 people were killed in Houthi missile strikes on King Khalid airport in Riyadh over the weekend, prompting Saudi Arabia's energy minister to promise a "serious response." Qatar Airways and Emirates have cancelled flights to Saudi Arabia and neighbouring states. The international consequences are no longer hypothetical. ICRC President Mirjana Spoljaric warned that civilians across the Middle East are bearing the cost: "The scale of death, displacement and damage to civilian infrastructure, including in Aden and Sanaa, is mounting at an alarming rate." The humanitarian toll is accelerating faster than any diplomatic process. Diplomatic responses remain fragmented. German Chancellor Friedrich Merz told Saudi Crown Prince Mohammed bin Salman that Iran must engage in serious negotiations, accusing Tehran of destabilising the region. Egyptian Foreign Minister Badr Abdelatty told his Iranian counterpart Abbas Araghchi that Houthi attacks on Saudi Arabia must halt immediately, while also declaring Gulf security "integral to Egypt's national security." Yet multiple analysts note that Iran's actual operational control over the Houthis is limited — Tehran provides financial and military support, but the group operates with substantial autonomy. The 2022 UN-backed truce is functionally dead. What has replaced it is a multi-front conflict in which internal Yemeni fighting, Houthi regional aggression, and great-power posturing feed each other in a self-reinforcing cycle. The humanitarian costs compound while the diplomatic toolkit shrinks.