Brazil launches formal process to quit block created by Hugo Chávez

South American presidents sign PROSUR agreement in Santiago, Chile

The withdrawal from UNASUR will be completed in six months; PROSUR has been created to replace it

The Brazilian government has quit the agreement that created UNASUR (Union of South American Nations), the first formal step for the country's withdrawal from the international alliance.

Brazil's decision was announced in a note sent by the Foreign Ministry

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