Since the end of the Cold War, Brazil has been seeking to play a leading role in regional affairs. Based on its special relationship with Argentina, it has formed the Southern Common Market (Mercosur), the Union of South American Nations, and the Community of Latin American and Caribbean States (CELAC). ) as the main content of the “concentric circle” regional diplomatic structure. However, due to its lack of political and economic strength, it is difficult for Brazil to continue to play a stable and leading role in regional affairs. Lula will serve as President of Brazil again in 2023 and strives to revitalize regional cooperation, but the prospects are not…