THE Polisario Front, Western Sahara's independence movement, said it was severing ties with Spain after Madrid backed Morocco's plan to give autonomy to the former Spanish colony. Spain has supported the autonomy plan as a way to resolve a long-running dispute over Western Sahara, which Morocco considers its own territory. But the Polisario, backed by Algeria, has rejected the autonomy proposal and wants an independence referendum. The Polisario said the plan aimed to legitimise the annexation of Western Sahara "ignoring the inalienable rights of the Saharawi people to self-determination and independence." Last month, Spain told Morocco it considered the autonomy…