The coup happened apparently against US wishes, showing the erosion of America’s influence in a region it once controlled.
In Mosul, the mechanics – and effectiveness – of US supporting role are not yet clear.
An exchange of ambassadors is part of Obama's policy of engagement over confrontation.
The troops will form 'belts' around volatile cities like Mosul, where some fear gains in stability will be lost when US troops pull out on June 30.
The fatal shooting of a young man on a crowded downtown street illustrates why Americans could have trouble completely leaving this troubled provincial capital.
Saturday's massive bomb in Kirkuk, combined with political gridlock, raises questions about how ready Iraq is for the withdrawal of US troops from cities by June 30.
A federal judge orders release of a Syrian national who Al Qaeda suspected was a US spy.
As US prepares to withdraw troops from major cities, bombings in Baghdad and near Kirkuk have the country on edge.