Why have Saudi Arabia and the Houthis resumed cross-border strikes?

Fighting between the Saudi-led military coalition and Yemen's Houthi movement has intensified sharply, shattering a period of relative calm established by a 2022 United Nations-brokered truce. Cross-border hostilities reignited in July after Houthi authorities permitted an aircraft from Iran to land at Sanaa's airport, defying Saudi airspace controls. In response, Saudi forces struck the airport to block Iranian flights, prompting immediate Houthi retaliation against Saudi targets, including Abha airport.

The conflict has since spread across multiple fronts. Houthi forces enforced a blockade on Saudi shipping lanes, launched attacks against maritime vessels and energy facilities, and seized remaining sections of Yemen's Red Sea shoreline. The Yemeni conflict also became an active front in wider Middle Eastern tensions following American and Israeli military strikes against Iran earlier in the year.

Recent hostilities have struck civilian areas in Yemen with high casualties. Houthi officials and local media reported that an air raid hit the rural settlement of al-Shariya, east of Sanaa, killing 44 people, including 21 children, and wounding 40 others. Witnesses and Houthi broadcasts described buildings collapsing onto families and a secondary blast hitting emergency personnel digging through rubble.

The Saudi-led coalition stated it has initiated an official inquiry into recent aerial operations. Simultaneously, ground combat has reignited between Houthi units and government-aligned forces across disputed zones, including an explosion at a market in Taiz province that killed about 30 people, with each faction blaming the other.

Houthi forces have launched coordinated waves of ballistic projectiles, cruise missiles, and uncrewed aircraft aimed deep within Saudi territory. Military spokesman Yahya Saree claimed assaults against sites such as Khalid International Airport, an Aramco pipeline pumping station in Dawadmi, and military positions in the southern border province of Najran.

While Saudi air defence batteries intercepted multiple incoming threats, falling fragments from a Sunday interception damaged the Aramco Tower in Riyadh's King Abdullah Financial District, shattering exterior windows. On the following Wednesday, coalition forces destroyed three cruise missiles heading for Riyadh. Cross-border strikes have claimed 26 lives within Saudi Arabia since fighting reignited over the summer.

The renewed hostilities have inflicted severe humanitarian harm on Yemen's civilian population. United Nations records indicate that over 1,600 individuals have lost their lives and more than 300,000 residents have been displaced from their homes since July.

The violence marks the collapse of diplomatic progress made since 2022, threatening to drag the nation back into the full-scale warfare that has destabilised the Arabian Peninsula since the Houthis captured Sanaa in 2014 and the Saudi-led coalition intervened in 2015.

Houthi leadership figures, including Mahdi al-Mashat, have pledged continued retaliation against Saudi Arabia for coalition bombardments, while Saudi authorities proceed with an official investigation into recent aerial strikes.