Urges States to take steps to ensure that components of embargoed items do not reach the South African military establishment and police through third countries; calls upon states to prohibit the export of spare parts for embargoed aircraft and other military equipment belonging to South Africa and any official involvement in the maintenance and service of such equipment; urges all States to prohibit the export to South Africa of items which they have reason to believe are destined for the military and/or police forces of South Africa, have a military capacity and are intended for military purposes, namely, aircraft engines, aircraft parts, electronic and telecommunication equipment, computers and four-wheel drive vehicles; requests of all States that henceforth the term "arms and related matériel" referred to in resolution 418 (1977) shall include, in addition to all nuclear, strategic and conventional weapons, all military, paramilitary police vehicles and equipment, as well as weapons and ammunitions, spare parts and supplies for the aforementioned and the sale or transfer thereof; calls upon all States to prohibit the import or entry of all South African armaments for display in international fairs and exhibitions under their jurisdiction; further requests all States to adopt measures to investigate violations, prevent future circumventions, and strengthen their machinery for the implementation of resolution 418 (1977) with a view to the effective monitoring and verification of transfers of arms and other equipment in violation of the arms embargo.