There, the de facto government of Juan Carlos Onganía proposed the creation within the American organization of a Defense Advisory Committee.

The bill established that the committee would advise on problems of military collaboration and would act "as a preparation body for self-defense against aggression".

There he denounced what he believed to be an aggression on the part of the British, citing the incident that occurred in South Georgia (or San Pedro Island) the previous month.

[9] The next day, following the success of Operation Rosario (which started the war), Roca was again invited to the session by the president of the Council.

[9] He accused the United Kingdom of aggression[10] and was quoted as saying: "What I must inform the Council is that today the Argentine Government has declared the recovery of their national sovereignty of the territories of the Falklands/Malvinas Islands, South Georgia and South Sandwich, in an act that responds to a just Argentine demand and also in response to legitimate defense against the recent acts of aggression provoked by the United Kingdom".

[11] As the conflict developed, then Secretary General of the United Nations Javier Pérez de Cuéllar summoned Roca together with British Ambassador Anthony Parsons to try to mediate.