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Iraq's request to the U.S.-led coalition for air strikes in the campaign to retake Tikrit from Islamic State insurgents is "imminent", a senior diplomat from a Western nation that is part of the coalition told Reuters on Tuesday. 

If the coalition accepts the request, it would see by far the biggest collaboration so far against the militants by Iraqi forces, the Iranian-backed paramilitaries and their Iranian advisers on the ground, and the United States and its allies.

There was no immediate confirmation from the Iraq government about the request, which the diplomat said would be positively received. "Once that's happened (that) we have gotten the request, we will do whatever we are asked to do," the diplomat said, speaking on condition of anonymity.

The coalition has been absent so far from the Tikrit campaign launched three weeks ago, the largest to be undertaken by the Iraqi forces and Iranian-backed Shi'ite Muslim militias since Islamic State overran a third of the country last year.

A military official within the coalition told Reuters on Tuesday that the coalition began providing intelligence, surveillance and reconnaissance for the Tikrit operation on March 21 after a request from the Iraq government. "The U.S. is now providing that support," he said.

More than 20,000 troops and allied Shi'ite paramilitary groups are taking part in the offensive which has been on pause for nearly two weeks after they suffered heavy casualties on the edge of the city, 160 kilometers (100 miles) north of Baghdad.