Iran-backed Houthi rebels captured Perim Island in the Bab el-Mandeb Strait Sept. 11, opening a new front at a vital global shipping chokepoint as a former Pentagon official warned Sunday the militants had entered a “kill box.”

The island’s capture came after a month-long offensive along Yemen’s western coast that killed more than 1,500 soldiers and forced Yemen’s government to acknowledge a “painful” defeat, according to The Associated Press.

“With Perim, they have gained what we could call the cork in the Red Sea bottle,” Morgan Murphy, a former Pentagon press secretary and retired Navy captain, told Fox News Digital.

“But they’ve put…

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