▁Following ▁Per ón ' s ▁July ▁ 1 9 7 4 ▁death , ▁his ▁wid ow ▁and ▁successor ▁Isabel ▁Per ón ▁named ▁him ▁Deput y ▁Econom y ▁Minister , ▁a ▁post ▁he ▁held ▁until ▁the ▁March ▁ 1 9 7 6 ▁coup ▁against ▁her ▁cha otic ▁presiden cy . ▁Di ▁T ella ▁then ▁spent ▁many ▁years ▁of ▁ex ile ▁in ▁Oxford , ▁where ▁he ▁wrote ▁a ▁book ▁about ▁his ▁experiences . ▁Return ing ▁to ▁Argentina ▁in ▁ 1 9 8 9 , ▁he ▁never ▁sever ed ▁his ▁links ▁with ▁the ▁city ▁and ▁university , ▁keeping ▁a ▁house ▁there ▁and ▁visit ing ▁every ▁spring . ▁ ▁Foreign ▁Minister ▁Per on ist ▁Carlos ▁Men em , ▁elected ▁President ▁of ▁Argentina ▁in ▁ 1 9 8 9 , ▁returned ▁di ▁T ella ▁to ▁the ▁post ▁of ▁Deput y ▁Econom y ▁Minister ▁under ▁Miguel ▁Ro ig , ▁and ▁following ▁the ▁elder ly ▁Ro ig ' s ▁death ▁days ▁later ▁he ▁was ▁appointed ▁Amb assador ▁to ▁the ▁United ▁States . ▁A ▁cabinet ▁sh ake - up ▁in ▁February ▁ 1 9 9 1 ▁resulted ▁in ▁his ▁succeed ing ▁Dom ingo ▁Caval lo ▁as ▁Foreign ▁Minister . ▁Caval lo ▁was ▁named ▁Econom y ▁Minister , ▁and ▁had ▁already ▁initi ated ▁Argentina ' s ▁rapp ro ch ement ▁with ▁the ▁United ▁Kingdom ▁and ▁United ▁States ; ▁diplom atic ▁relations ▁with ▁the ▁U . K ▁had ▁been ▁res umed ▁in ▁February ▁ 1 9 9 0 , ▁and ▁Argentina ▁had ▁participated ▁in ▁Operation ▁Des ert ▁Storm . ▁ ▁However , ▁Argentina