NATO WARNS SOVIET ITS MOVES IN AFRICA ENDANGER DETENTE
Alliance leaders issue communique, Washington, warning USSR that its actions in Africa endanger detente and jeopardize further improvement of E-W relations; endorse plans to counter growing strength of Warsaw Pact nations with long-range defense program stressing antitank weapons in Central Eur and integrated allied air defense; cost of program estimated at $60 billion to $80 billion, with US probably contributing slightly more than 50%; program is hailed by Pres Carter, who notes that no procedures have as yet been devised to carry it out; Carter and orgn sec gen Dr Joseph M A H Luns illus (M)