I believe Iraqi officials are beginning to realize, perhaps too late, that getting in bed with Iran is not in the best long term interests. Yesterday, The Washington Post published a story citing a source within the Iraqi government saying Sunday that it had "concrete evidence" Iran is fomenting violence in Iraq and that a high-level panel has been formed to document the proof.
The significance here is that it is a named Iraqi official, Ali al-Dabbagh, himself an official government spokesperson, who called reporters late Sunday night to say "There is an interference and evidence that they have interfered in Iraqi affairs." Dabbagh went on to say that the proof was characterized as "concrete evidence."
The Iraqi government is very careful with regards to Iran. Historically, the two never got along. After all, Iraqis are Arabs while the Iranians are Persian. They also fought a rather significant war in recently memory not forgotten by either side. However, with the fall of a strong centralized central government, the Iranian backed Shia were able to make significant inroads into the new Iraqi government.
The Iranian-backed radical cleric al-Sadr was a huge enabler in al-Maliki's move to PM. The support was not just official. Iranian money and support flowed across the borders to the destitute Shia ghettos. The Iraqis government had to choice but to tread lightly when dealing with the issue of Iran's role in the insurgency.
That appears to be changing. This move parallels Maliki's offensive operations against illegal militias and might be oriented at pressuring Iran to cut military its military support.
What good will it do? As we've seen recently, you can have video evidence on the nightly news but the other side will simply call it 'fabricated propaganda.' In the digital age, pictures are no longer worth a thousand words, especially when the target is a country who helps you pay your bills and fight against the 'occupiers.'
International pressure is unlikely as certain members of the U.N. Security Council would never vote for any type of sanction against Iran. The best outcome comes from the knowledge that Iraq itself is looking to hopefully cut ties, at least at the government level, with Iran. No one in the region wants Iran to expand its sphere of influence into Iraq. Perhaps the Iraqis are becoming aware that they are the only ones that can prevent it.