In 1993, he led a high level governmental task force to the exploratory conversations with the National Union for the Total Independence of Angola (UNITA) that took place in Zambia.

Being fully oriented by President dos Santos, the newly appointed minister began an intensive and tireless diplomatic campaign in order to isolate UNITA politically, and weaken its military capabilities through sanctions on its arms suppliers.

In his book "15 Meses no Ministério dos Negócios Estrangeiros" former Portuguese Minister of Foreign Affairs Diogo Freitas do Amaral described de Miranda as a solid politician with whom he was very pleased to work.

In 2006 de Miranda oversaw, under the watch of President dos Santos, the successful elections in the Democratic Republic of Congo, as part of the stabilizing process in the Great Lakes region.

Following the assassination of presidential candidate Baciro Dabo, he said on state radio that the African Union wanted the election to go ahead as scheduled.