The Brits get it-
The raid on Arbil took place within hours of President George Bush making an address to the nation on 10 January in which he claimed: "Iran is providing material support for attacks on American troops." He identified Iran and Syria as America's main enemies in Iraq though the four-year-old guerrilla war against US-led forces is being conducted by the strongly anti-Iranian Sunni-Arab community. Mr Jafari himself later complained about US allegations. "So far has there been a single Iranian among suicide bombers in the war-battered country?" he asked. "Almost all who involved in the suicide attacks are from Arab countries."
It seemed strange at the time that the US would so openly flout the authority of the Iraqi President and the head of the KRG simply to raid an Iranian liaison office that was being upgraded to a consulate, though this had not yet happened on 11 January. US officials, who must have been privy to the White House's new anti-Iranian stance, may have thought that bruised Kurdish pride was a small price to pay if the US could grab such senior Iranian officials.
For more than a year the US and its allies have been trying to put pressure on Iran. Security sources in Iraqi Kurdistan have long said that the US is backing Iranian Kurdish guerrillas in Iran. The US is also reportedly backing Sunni Arab dissidents in Khuzestan in southern Iran who are opposed to the government in Tehran. On 4 February soldiers from the Iraqi army 36th Commando battalion in Baghdad, considered to be under American control, seized Jalal Sharafi, an Iranian diplomat.
The raid in Arbil was a far more serious and aggressive act. It was not carried out by proxies but by US forces directly. The abortive Arbil raid provoked a dangerous escalation in the confrontation between the US and Iran which ultimately led to the capture of the 15 British sailors and Marines - apparently considered a more vulnerable coalition target than their American comrades. (The Independent.)