Sábato were tasked to continue the dialogue in 1984. Once the proposal was examined in detail by high ranks in both governments, the Brazilians decided they could not commit to it. Abdenur informed his counterpart about the lack of consensus inside Brazil, but reiterated that Brazil's rejection of the joint proposal should not be interpreted as an ambition to conduct PNEs. In May 1985 in Buenos Aires, Caputo met with Olavo Setúbal, Guerreiro's successor. Part of their agenda consisted of the potentiality of negotiating a mutual safeguards system and jointly renouncing the option PNEs. Argentina stepped up the pressure and, six months later, Argentine President Raúl Alfonsín and Brazilian President José Sarney met in Foz do Iguaçu, Paraná, Brazil. On that occasion, Alfonsín proposed the establishment of a joint safeguards regime, to which Sarney countered with a more diluted proposal to establish a bilateral working group to discuss the issue. Alfonsín agreed and the Foz do Igauçu Joint Declaration on Nuclear Policy (Declaração Conjunta sobre Política Nuclear de Foz de Iguaçu) was signed on 29 November 1985. In the following year, cooperation among the two countries intensified, evidenced by new joint protocols and declarations. In a move to increase transparency and trust as much as "lock in" the Brazilian side, President Alfonsín invited President Sarney to visit the Pilcaniyeu nuclear power plant, which was considered a cause for concern in Brazil. After 17 July 1987, visit, the two presidents issued the Viedma Joint Declaration on Nuclear Policy, expressing the importance of building mutual trust and reiterating the peaceful nature of nuclear activities in both countries. Before publicly announcing that Brazil had achieved uranium enrichment capacity, Sarney sent Ambassador Rubens Ricupero as an envoy to Buenos Aires to personally inform Alfonsín. In April 1988, Sarney invited Alfonsín to participate in the inauguration of the Experimental Center of Aramar in Iperó, São Paulo. On that occasion, the two countries issued the Declaration of Iperó, which raised the status of the joint working group on nuclear issues, which had been created in 1985, to a permanent committee, thereby institutionalizing the former ad hoc body and establishing regular meetings. In November 1988, following another joint presidential visit – this time to the Argentine nuclear plant in Ezeiza, Buenos Aires – the two heads of state issued the Ezeiza Declaration, which emphasized the peaceful purpose of both countries’ nuclear programs, pledged to continue "exchange of