The Rio Protocol failed to precisely resolve the border along a little river in the remote ''Cordillera del Cóndor'' region in southern Ecuador. This caused a long-simmering dispute between Ecuador and Peru, which ultimately led to fighting between the two countries; first a border skirmish in January–February 1981 known as the Paquisha Incident, and ultimately full-scale warfare in January 1995 where the Ecuadorian military shot down Peruvian aircraft and helicopters and Peruvian infantry marched into southern Ecuador. Each country blamed the other for the onset of hostilities, known as the Cenepa War. Sixto Durán Ballén, the Ecuadorian president, famously declared that he would not give up a single centimeter of Ecuador. Popular sentiment in Ecuador became strongly nationalistic against Peru: graffiti could be seen on the walls of Quito referring to Peru as the "''Cain de Latinoamérica''", a reference to the murder of Abel by his brother Cain in the Book of Genesis.