The talks in Doha, which will be the fourth time Taliban officials have met with American negotiators in recent months, are expected to focus on the details of two issues that both sides said they reached an agreement on in principle last month.

Under that framework, the Taliban would agree to keep Afghan territory from being a haven for terrorists, opening the door to a deal that could include an American troop withdrawal.

After the last round of talks, American officials said that any withdrawal deal must include the Taliban’s agreeing to a cease-fire and to joining talks with the Afghan government. The Taliban negotiators, the American officials said, did not have the authority to discuss a cease-fire or negotiations with the Afghans, and asked for time to return to their leadership.