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A soldier aims an automatic rifle through a peephole in a wall at Raqqa, Syria, on June 11, 2017.(Photo: Youssef Rabie Youssef, European Pressphoto Agency)

WASHINGTON New efforts by Iranian-backed militias to control supply lines in southern Syria highlight an alarming trend in the war-torn region: Militias and their foreign backers are accelerating their rivalry for power as the U.S.-led coalition shrinks the Islamic States territory.

You can see everyone maneuvering frenetically, said Michael Knights, an analyst at the Washington Institute for Near East Policy.

The problem surfaced in recent weeks when Iranian-backed militias maneuvered close to a U.S. outpost in southern Syria. The outpost at al-Tanf is a base for several hundred coalition advisers and the local forces they are supporting.

Last week, U.S.-led coalition aircraft struck the militias for a third time to warn them away from U.S. forces. An American warplane also shot down an Iranian-built armed drone operating in the same area after it fired at U.S. advisers and their partner forces.

Analysts say the primary objective of the Iranian forces is not to threatenU.S. forces. Instead, the militias are defending Irans supply routes to Lebanon that go through Iraq and southern Syria.

The Islamic State, or ISIS, "was always destined to be defeated, and now the U.S. and its allies have to contend with an emboldened, belligerent, and more powerful Iran, which has cultivated more proxies than ever, saidAli Khedery, a former special assistant to five U.S. ambassadors in Iraq.

The Pentagon sees the Iranian-backed militias as a potentialdistraction from the fight against ISIS.

The coalition calls on all parties in southern Syria to focus their efforts on the defeat of ISIS, which is our common enemy and the greatest threat to the region and the rest of the world, said Col. Ryan Dillon, a Pentagon spokesman.

Analysts say the array of militias and foreign powers in the region have differing objectives, which are coming to the forefront as ISIS is pushed out of its strongholds in Iraq and Syria, leaving a power vacuum.

For countriessuch as Iran and Russia, defeating ISISwas never themain objective. Both countries are the principle backers of Syrian President Bashar Assad.

Turkey, a NATO member, has supported opponents of Assadbut mistrusts the Syrian Kurds, who are backed by the United States and are among the most effective fighters against ISIS.

ISIS is almost an afterthought, Knights said. Theyre a speed bump.

Other developments suggest that rival powers are positioning themselves for the defeat of ISIS. In Iraq, powerful Shiite militias, some supported by Iran, have moved close to the Syrian border, raising concerns about their objectives.

The militias, called popular mobilization forces, have helped Iraqs military cut ISIS supplylines during an offensive in Mosul. With ISIS nearly defeated in that key city, some analysts fear the Shiite militias now want to spread their influence by trying to control Iraq's border with Syria.

I dont want the popular mobilization forces to be part of any regional political game. But it looks like they are, said Ismael Alsodani, a retired Iraqi brigadier general who served as a military attach in Washington.

The maneuvering has intensified as ISIS' grip on territory has diminished since the militant groupswept into Syria and Iraq three years ago.

U.S.-backed Iraqi security forces are close to clearing militants from Mosul, the countrys second-largest city. In Syria, the U.S.-backed Syrian Democratic Forces have launched an offensive in Raqqa, the Islamic States de facto capital.

Nearly three years of bombing has devastated ISIS'leadership and destroyed much of the militant group's weapons and equipment.

Everyone knew ISIS would be defeated, said Lukman Faily, a former Iraqi ambassador to the United States. We see now that many of the powers in the region, and locally, are trying to strengthen their position for when ISIS is gone.

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Iran attempts to expand control through Syria as ISIS nears defeat - USA TODAY