Oil advanced as Iran-backed Houthi militants in Yemen entered the Middle East war and more US troops arrived in the region, raising fears the widening conflict will cause further chaos for energy markets. Bloomberg's Anthony di Paola reports. -------- More on Bloomberg Television and Markets Like this video? Subscribe and turn on notifications so you don't miss any videos from Bloomberg Markets & Finance: https://tinyurl.com/ysu5b8a9 Visit http://www.bloomberg.com for business news & analysis,