US Lieutenant General Robert Caslen, the head of the NATO training mission, said the alliance had been willing to sign a deal with Iraq's government and did not require parliamentary approval, but Baghdad's lawyers said MPs would need to vote on any pact.
By contrast, the collapse of an agreement for a post-2011 US training mission, which was being discussed between Baghdad and Washington, was due to the US's insistence that it be approved by lawmakers.
The United States has signed over its final base in the country, and virtually all remaining American forces in Iraq are due out in the coming days.
Admiral James Stavridis, NATO's Supreme Allied Commander, Europe, said in a letter addressed to Caslen and read out at today's ceremony that "there were hopes to continue the mission beyond 2011, and we are concluding earlier than we had hoped." Caslen told reporters after the ceremony that NATO was willing to sign an agreement with Iraq's executive, "but... as the lawyers reviewed it and looked at it, they thought that the immunities had to go back down to the parliament."
"They knew they weren't going to get that (approved)," he said. He continued: "The secretary general of NATO had the authority to go ahead and approve it with whatever (authority) the Iraqi government decided."