In a series of meetings with U.S. Ambassador Ellsworth Bunker, South Vietnamese President Nguyen Van Thieu insists that North Vietnam assent to three conditions prior to a bombing halt. He said the North Vietnamese had to (1) agree to respect the neutrality of the Demilitarized Zone (DMZ), (2) stop shelling South Vietnamese cities and towns, and (3) agree to South Vietnamese participation in the Paris talks. He also demanded that the National Liberation Front, the Communist political organization in South Vietnam, be excluded from the negotiations. Thieu seemed to soften during his discussions with Bunker: on October 22, he announced that he would not oppose a bombing halt.