MIDEAST STOCKS-UAE hit by poor Q4 earnings, Kuwait retreats in volatile trade

* Dubai's Air Arabia sinks on Q4 net loss * Union Properties drops on lower full-year net profit * Dana Gas down on Q4 profit drop, Egypt operations * Kuwait's Agility tumbles after announcing Iraq arbitration * Egypt's Juhayna cools after strong gains DUBAI, Feb 9 (Reuters) - Poor fourth-quarter earnings from two United Arab Emirates companies weighed on stock markets there on Thursday while Kuwait pulled back in another day of volatile trade. Dubai's index fell 1.2 percent to 3,683 points, ret