The U.N. Security Council unanimously approved a resolution to establish a political mission to monitor and verify a future cease-fire in Colombia that would end Latin America’s longest-running guerrilla conflict.

The resolution welcomes the progress in negotiations between Colombia’s government and the Revolutionary Armed Forces of Colombia and notes their joint request last week for a U.N. monitoring mission. In a rare move for the often-divided council, all 15 members co-sponsored the resolution.