In August 2017 , six members of UNASUR — Argentina , Brazil , Chile , Colombia , Paraguay and Peru — joined in forming the Lima Group , a coalition of Western Hemisphere nations that repudiates the Venezuela government of Nicolás Maduro as antidemocratic . In February 2018 , Maduro was disinvited from the Summit of the Americas hosted by Peru ( held in Lima in April 2018 ) . In response , Bolivia 's leftist president Evo Morales urged Unasur to defend Venezuela , stating " Unasur should call an emergency meeting and enforce the sovereignty of a brotherly people . " Morales acceded to the rotating role of president pro tempore of UNASUR on 17 April 2018
Summit of the Americas
8th Summit of the Americas
Union of South American Nations