In eastern Syria, where the US -backed Syrian Democratic Forces have captured Raqqa and pursued ISIS' remnants in the Middle Euphrates River Valley, the fight was not over, Gedney said.
The United States has led an worldwide coalition conducting air strikes against Islamic State since 2014 when the group swept across a third of Iraq.
With the collapse of the ISIS caliphate in 2017, what's left of the terrorist group in Iraq and Syria is on the run, with some fighters moving west toward Damascus into Syrian regime-controlled territory and away from where the USA -led coalition will work to defeat them.
U.S. officials have said in the past that the Syrian government forces are too few, too poor and too weak to fight Islamic State. Most of the fighters had been killed or captured over the past three years, the coalition said on Wednesday.
Syrian government forces and their allies, backed by Russian air power, are mostly on the western side of the Euphrates, while forces backed by the coalition are on the eastern bank.
A two-star British general in the coalition's war against ISIS confirmed the "movement of limited numbers of ISIS militants westwards", but said the USA -led coalition won't pursue them because the area is operated by the regime.
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In a video briefing to the Pentagon from Baghdad, Gedney said that the free movement of the ISIS fighters was evidence "the regime is either unwilling or unable to defeat [ISIS] within their borders".
Russian Federation and the United States have set up a communications channel to reduce the chance of fighting between the two rival campaigns against Islamic State.
"We are taking those individuals off the battlefield", Gedney said, calling on the Syrian government to clear the areas from Daesh under its control.
The coalition estimates that fewer than 1,000 Islamic State fighters remain in Iraq and Syria.
Gerasimov said that a military base in the Al-Tanf region of Syria is being used to re-train the former ISIS combatants, give them a different name like New Syrian Army and send them out to destabilize the country.
However, analysts say the military campaign only addressed the territorial aspect of ISIS and that the group is retreating into a "virtual caliphate", where it will attempt to remain relevant and inspire more lone wolf attacks.