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One on an isis controlled oil refinery are having a crippling impact on the militants. and on the key city of tikrit and inside of the ranks and a group struggling to maintain control. one analyst said the key challenge facing isis is more internal than external lets bring in jim miklaszewski at d.o.d. lets start with isis in iraq focusing on tikrit that is a key city. >> reporter: that is right. and tikrit has become critical in determining whether the ultimate u.s. strategy to defeat and degra...