Here's another perspective on this subject. It really doesn't sound good ...
http://afp.google.com/article/ALeqM5gdnm9QESN2OObJBXg6IAqX7WbaRgWASHINGTON (AFP) — The United States said Monday it is still ready for talks with Iran on security in Iraq but said they are "meaningless" as long as Tehran continues its alleged support for Shiite militias there.
State Department deputy spokesman Tom Casey was reacting to Iran's announcement it will not hold a fourth round of security talks with the United States as long as US forces continue attacking Shiite militias in Baghdad.
"It's meaningless to have talks on anything with Iran as long as they don't change their behavior," Casey told reporters.
...
In previous security talks, Casey said, the United States has raised "the unhelpful behavior" of Iran towards Iraq in which it allegedly funds, trains and offers material support to militias.
Iran, whose ties with Washington have been severed since 1980 and which wants US troops to leave Iraq, strongly denies the allegations.