The UN General Assembly, by its resolution 60/119 of 8 December 2005, requested the annual observance of the Week of Solidarity with the Peoples of Non-Self-Governing Territories.
In the UN Charter, a Non-Self-Governing Territory is defined as a Territory “whose people have not yet attained a full measure of self-government”.
In 1946, several UN Member States identified a number of Territories under their administration that were not self-governing and placed them on a UN list (Western Sahara listed in 1963). Countries administering Non-Self-Governing Territories are called administering Powers. As a result of the decolonization process over the years, most of the Territories were removed from the list.
It urged the administering Powers concerned to take effective measures to safeguard and guarantee the inalienable rights of the peoples of the Non-Self-Governing Territories to their natural resources, including land, and to establish and maintain control over the future development of those resources, and requests the Administering Powers to take all necessary steps to protect the property rights of the peoples of those Territories.
It also urged all States, directly and through their action in the specialized agencies and other organizations of the United Nations system, to provide moral and material assistance to the peoples of the Non-Self-Governing Territories.
Source : http://www.un.org/en/events/nonselfgoverning/