Democratic Republic of Congo President Felix Tshisekedi has long ruled out dialogue with the Rwanda-backed M23 rebels rampaging through eastern parts of his country, but a string of defeats and waning regional support have forced him think again.

DAKAR, Senegal — Congo’s government and the M23 rebel group will participate in peace talks on March 18, Angola said Wednesday. A statement from Angolan President João Lourenço’s office said they would begin “direct peace negotiations” in the Angolan capital, Luanda.

Angola has acted as a mediator in the conflict in eastern Congo, which escalated in late January when the Rwanda-backed rebels advanced and took control of the strategic eastern Congo city of Goma. In February, M23 seized Bukavu, eastern Congo’s second biggest city.