By Warren Strobel and Andrew Osborn LONDON (Reuters) - Iraqi Prime Minister Haider al-Abadi said on Thursday he feared lower revenues from falling global oil prices could hurt his country's military campaign against Islamic State. Speaking after attending a meeting of members of the U.S.-led coalition against Islamic State in London, Abadi said allies could help by potentially allowing Baghdad to defer payment for ammunition and *******. Iraq's eco**my and budget relies 85 percent on oil and this has been disastrous for us," he told a news conference. "We don't want to see a reverse of our military victory due to our fiscal and budget problems." His comments came as U.S. Defense Secretary Chuck Hagel in Washington blasted some of Abadi's recent criticism of the pace of past U.S. and coalition efforts to support Iraq.