The following makes me wonder whether some kind of quid pro quo has been reached between the U.S. and Iran. If so, is it in any way related to the U.S. position on the Iranian nuclear program and is it a signal that Washington and Tehran may soon be (or already are) negotiating?

From the New York Times:

The Iraqi government on Saturday credited Iran with helping to rein in Shiite militias and stemming the flow of weapons into Iraq, helping to improve the security situation noticeably.

The Iraqi government’s spokesman, Ali al-Dabbagh, speaking at a lunch for reporters, also said that the Shiite-dominated government was making renewed efforts to bring back Sunni Arab ministers who have been boycotting the government for more than four months.

Speaking about Iran, he said that that government had helped to persuade the Shiite cleric Moktada al-Sadr to ask his Mahdi militia to halt attacks. Mr. Sadr ordered his militia to stop using weapons in early September, and officials say that the militia’s relative restraint has helped improve stability. They say it also seems to have helped decrease the frequency of attacks with explosively formed penetrators, a powerful type of bomb that can pierce heavy armor.

Mr. Dabbagh’s comments echoed those of the American military here, who in recent days have gone out of their way to publicly acknowledge Iran’s role in helping to slow the flow of weapons into the country. [My emphasis]