▁control ▁of ▁the ▁Pers ian ▁G ulf . ▁Pak ist ani ▁leader ▁Muhammad ▁Z ia - ul - Ha q ▁had ▁previously ▁had ▁poor ▁relations ▁with ▁Carter ▁due ▁to ▁Pakistan ' s ▁nuclear ▁program ▁and ▁the ▁execution ▁of ▁Z ulf ik ar ▁Ali ▁Bh utto , ▁but ▁the ▁Soviet ▁invasion ▁of ▁Afghan istan ▁and ▁inst ability ▁in ▁Iran ▁re inv ig or ated ▁the ▁traditional ▁Pakistan – Un ited ▁States ▁al liance . ▁In ▁co operation ▁with ▁Sa udi ▁Arab ia ▁and ▁Pakistan ' s ▁Inter - Services ▁Int elligence ▁( IS I ), ▁Carter ▁increased ▁aid ▁to ▁the ▁mu j ah ide en ▁through ▁the ▁C IA ' s ▁Operation ▁Cy clone . ▁Carter ▁also ▁later ▁announced ▁a ▁U . S . ▁boy c ott ▁of ▁the ▁ 1 9 8 0 ▁Summer ▁Olympics ▁in ▁Moscow ▁and ▁im posed ▁an ▁embargo ▁on ▁sh ipping ▁American ▁whe at ▁to ▁the ▁Soviet ▁Union . ▁The ▁embargo ▁ultimately ▁hurt ▁American ▁far mers ▁more ▁than ▁it ▁did ▁the ▁Soviet ▁economy , ▁and ▁the ▁United ▁States ▁lifted ▁the ▁embargo ▁after ▁Carter ▁left ▁office . ▁ ▁The ▁Soviet ▁invasion ▁of ▁Afghan istan ▁brought ▁a ▁significant ▁change ▁in ▁Carter ' s ▁foreign ▁policy ▁and ▁ended ▁the ▁period ▁of ▁det ente ▁that ▁had ▁begun ▁in ▁the ▁mid - 1 9 6 0 s . ▁Return ing ▁to ▁a ▁policy ▁of ▁contain ment , ▁the ▁United ▁States ▁recon ci led ▁with ▁Cold ▁War ▁al lies ▁and ▁increased ▁the ▁defense ▁budget , ▁leading ▁to ▁a ▁new ▁arms ▁race ▁with ▁the ▁Soviet ▁Union