The Protocol of Peace, Friendship, and Boundaries between Peru and Ecuador, or Rio Protocol for short, was an international agreement signed in Rio de Janeiro, Brazil, on January 29, 1942, by the foreign ministers of Peru and Ecuador, with the participation of the United States, Brazil, Chile, and Argentina as guarantors. The Protocol was intended to finally resolve the long-running territorial dispute between the two countries, and brought about the official end of the Ecuadorian–Peruvian War of 1941–1942. Nevertheless, the Protocol was incomplete, and war broke out between Peru and Ecuador twice more, in 1981 and in 1995, before the signing of the Itamaraty Peace Declaration which brought final resolution to the dispute.