Initially, Alfonsín refused to foster diplomatic relations with the Brazilian military government, and only did so when the dictatorship ended and José Sarney became president. One of their initial concerns was to increase Argentine–Brazilian trade. Both presidents met in Foz do Iguaçu and issued a joint declaration about the peaceful use of nuclear power. A second meeting in Buenos Aires strengthened the trade agreements. Argentina and Brazil signed the Program of Integration and Economic Cooperation (PICE), and in 1988 both countries and Uruguay agreed to create a common market. This led to the 1991 Treaty of Asunción, that created the Mercosur.