Iranian President Ebrahim Raisi said on Monday the United States' "military failure" in Afghanistan offered an opportunity to establish lasting peace in the country.
Taliban insurgents took control of the Afghan capital of Kabul on Sunday following a rout of the U.S.-backed Afghan army as foreign forces withdrew from Afghanistan.
Washington has accused Iran in the past of providing covert aid to Taliban fighters against U.S. forces. Tehran, which supports an inclusive Afghan government that would include all ethnic groups and sects, has denied this.
"America's military defeat and its withdrawal must become an opportunity to restore life, security and durable peace in Afghanistan," Iran's state TV quoted Raisi as saying.
"Iran backs efforts to restore stability in Afghanistan and, as a neighboring and brother nation, Iran invites all groups in Afghanistan to reach a national agreement."