WASHINGTON (AP) — The Trump administration is poised to announce Friday that it is withdrawing from a treaty that has been a centerpiece of superpower arms control since the Cold War and whose demise some analysts worry could fuel a new arms race.

An American withdrawal, which has been expected for months, would follow years of unresolved dispute over Russian compliance with the pact, known as the Intermediate-Range Nuclear Forces, or INF, treaty. It was the first arms control measure to ban an entire class of weapons: ground-launched cruise missiles with a range between 500 kilometers (310 mi...