 And have formed a movement informally called the Coffee Club, created in the 1990s, which highly opposes to the reform that the Group of Four (G4) suggests.In line with the Castañeda Doctrine of new openness in Mexico's foreign policy, established in the early first decade of the 21st century, some political parties have proposed an amendment of the Constitution in order to allow the Mexican army, air force or navy to collaborate with the UN in peacekeeping missions.As a founding member of the Organization of American States (OAS), Mexico has actively participated in the intergovernmental organization.