UNITED NATIONS (AP) — U.S. Ambassador Nikki Haley urged all countries on Thursday to ensure that the Islamic State extremist group faces "an enduring defeat" and said the United States will deepen partnerships with countries fighting terrorism "when force is necessary."

She told the Security Council that the militant group's ideology has taken root in new corners of the world, demonstrating that it is "an enemy that adapts, and one that will seek out the world's ungoverned spaces."

Haley urged countries to outsmart IS which is also known as ISIL, deny its fighters and supporters "safe haven,"...