Yemen's Houthi leader Abdul-Malik al-Houthi has warned of 'full escalation' against Saudi Arabia, coinciding with Riyadh's announcement of a new maritime defense coalition to counter Houthi threats in the Red Sea. The coalition, involving 43 countries, aims to secure navigation routes and energy supplies in the region. Tensions escalate as the Houthis claim responsibility for attacks on Saudi vessels and deny involvement in a drone attack on an Egyptian LNG terminal.