Until Jimmy Carter's presidency, we (the US) were strongly allied with Turkey, Iran, Saudia Arabia, Lebanon and Israel. Three different religions and lots of animosity between them, but all good friends to us.

We most certainly could be allied with Serbia (and Croatia) after the breakup of the old Yugoslavia, and still be at odds with Russia and their tendency for expansionism. For someone to put out the simplistic statement "Anyone who is an enemy of our enemy is our friend." and suggest that is the depth and breadth of the US foreign policy does not deserve to be given the time of day.