The talks have proceeded on several tracks, including through nongovernmental intermediaries and Arab and European governments. The Taliban has made clear its preference for direct negotiations with the Americans and has proposed establishing a formal political office, with Qatar under consideration as a venue, according to U.S. officials.

An attempt to open talks with the insurgent group failed late last year when an alleged Taliban leader, secretly flown by NATO to Kabul, turned out to be a fraud. “Nobody wants to do that again,” a senior Obama administration official said.