Russia to Hold YUKOS Auction  MOSCOW (Reuters) - Russia said on Friday it would go ahead  with an auction to sell the key asset of embattled oil company  YUKOS &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=YUKO.MM target=/stocks/quickinfo/fullquote"&gt;YUKO.MM&lt;/A&gt; despite a U.S. bankruptcy court decision to  block it for several days.