"Since our coalition was formed in 2014, ISIS has lost 95 per cent of the territory it once controlled in Iraq and Syria," Washington's envoy to the coalition, Brett McGurk, said yesterday after a meeting in Jordan, using an alternative acronym for IS.
The jihadist group swept across Syria and Iraq the same year, declaring a cross-border "caliphate" in territory roughly the size of Britain, attracting thousands of foreign fighters.
But several military offensives, including those backed by the US-led coalition, have since seen IS lose most areas it once controlled.
With the jihadists' dreams of statehood lying in tatters following the battlefield defeats, Western attention is increasingly pivoting to trying to block foreign fighters from returning home to carry out attacks.
McGurk insisted that flows of foreign IS fighters into Syria have "nearly stopped", and that jihadists are increasingly being picked up as they cross borders.
"We are enhancing cooperation and border security, aviation security, law enforcement, financial sanctions, counter-messaging, and intelligence sharing to prevent ISIS from carrying out attacks in our homelands," he said.
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