DUBAI, United Arab Emirates (AP) — High above Yemen’s rebel-held city of Hodeida, a drone controlled by Emirati forces hovered as an SUV carrying a top Shiite Houthi rebel official turned onto a small street and stopped, waiting for another vehicle in its convoy to catch up. Seconds later, the SUV exploded in flames, killing Saleh al-Samad, a top political figure. The drone that fired that missile in April was not one of the many American aircraft that have been buzzing across the skies of Yemen, Iraq and Afghanistan since Sept. 11, 2001. It was Chinese.. Across the Middle East,...