World powers are preparing to meet in London to discuss ways to strengthen Yemen's government in the face of a rising threat posed by al-Qaeda's regional affiliate.<br /><br />The one-day conference on Wednesday brings together representatives from 21 nations for talks on addressing Yemen's security situation and bolstering its faltering economy.<br /><br />But as Al Jazeera's Mohamed Vall reports from the capital, Sanaa, not all Yemenis are happy with the notion of foreign intervention.