The conflict may have slowed, but not stopped, Iran’s nuclear program, officials and experts said. Chief among President Trump’s reasons for launching the war in Iran was preventing it from building a nuclear weapon. More than five months in, officials and experts say, the conflict may have slowed Iran’s nuclear program but not stopped it. Because Iran has barred U.N. inspections of its most sensitive nuclear sites — a key part of any eventual peace deal — the precise fate of its highly enriched nuclear fuel is unknown. And despite strikes on three key nuclear sites in 2025 and 2026,...