Iraq is requesting the accelerated delivery of pledged U.S. military support, particularly Apache helicopters, F-16 fighters and surveillance equipment, to help Prime Minister Nouri Maliki’s government push back radical Islamist fighters who have claimed large sections of western Iraq in recent days.

Iraq’s ambassador to the U.S., Lukman Faily, said in an interview Wednesday his government is concerned Washington and other Western governments aren’t fully aware of the imminent threat posed by the Islamist militia, called the Islamic State of Iraq and al-Sham, to global security.

“What we are saying is that there needs to be a sense of urgency,” Mr. Faily said in Washington. “We now expect the U.S. to appreciate this sense of urgency.” […]