Do we need the Americans?(I)

"In an interview in the Washington Post, Iraqi President Jalal Talibani said Iraq still needs foreign troops and would like a small U.S. presence of 10,000 troops and two airbases for the long term.

Does Iraq, or some other countries, really need foreign existence on its soil? What criterion is to decide it? Is it Iraq sovereignty? And what is it meant by 'sovereignty' in the new globalized world. Would such U.S. troops presence violate Iraq sovereignty?"
Ibn Alrafidain