The Gulf Arab emirate of Abu Dhabi bought a $7.5 billion stake in Citigroup, America’s largest bank, on Tuesday, making it the bank’s largest shareholder. As the U.S. credit crisis worsens and the price of oil hovers close to $100 a barrel, the injection of capital from oil-rich Gulf states is seen as a bailout of banks in trouble. We speak with NYU economics professor, Nouriel Roubini, and Hampshire College professor, Michael Klare, author of “Blood and Oil.” [includes rush transcript]