Saudi Arabia and Yemen's Houthi rebels have traded fresh attacks over the weekend, underscoring a sharp escalation in the conflict. DW speaks to Hannah Porter, a Yemen and Houthi researcher at ARK group. #dwnews 00:00 Saudi Arabia partially reopens Riyadh airport amid strikes 00:29 Aftermath of reported airstrikes in Sanaa and Hodeida 01:15 Fragile 2022 ceasefire collapses 01:41 Hannah Porter analysis: Can Riyadh realistically keep its airport open?