During his two terms, he led mediations between Britain and Argentina in the aftermath of the Falklands War and promoted the efforts of the Contadora Group to bring peace and stability to Central America.
Selama 2 masa jabatannya, ia memimpin mediasi antara Britania Raya dan Argentina setelah Perang Malvinas dan memperkembangkan usaha Grup Contadora untuk membawa perdamaian dan stabilitas di Amerika Tengah.