Later, he served as Ambassador of Venezuela to the Organization of American States (OAS) and as head of the Presidential Commission of the Non-Aligned Movement.
Moncada assumed the Vice-Ministry for North America, and then replaced Delcy Rodríguez as Foreign Affairs Minister during the 2017 Constituent Assembly election.
[2][3] In January 2019 (during the 2019 Venezuelan presidential crisis), the National Assembly of Venezuela appointed Gustavo Tarre Briceño as representative to the OAS, an international organization which does not recognize Nicolás Maduro as president.
Antigua and Barbuda, Bolivia, Dominica, Grenada, Mexico, Saint Vincent and the Grenadines, Suriname, Uruguay and Venezuela voted against the change.
According to The Washington Post, this acceptance undermines Maduro's presence internationally and marks a step in the official recognition of Guaidó's government.