Urges all States to take the necessary steps and to exercise the utmost vigilance against the menace posed by the activities of mercenaries and to take necessary legislative measures to ensure that their territories and other territories under their control, as well as their nationals, are not used for the recruitment, assembly, financing, training and transit of mercenaries for the planning of activities designed to destabilize or overthrow the Government or threaten the territorial integrity and political unity of sovereign States or to promote secession or fight the national liberation movements struggling against colonial or other forms of alien domination or occupation;