If the plan is not to their liking, which is obviously the case, then it is incumbent upon Algeria and the Polisario to step up to the plate and propose a non-obstructionist, realistic alternative.
Si el plan no es de su agrado, que obviamente es el caso, entonces es de su incumbencia que Algeria y el Polisario se hagan cargo de su deber y propongan una alternativa no obstruccionista y realista.