Presidents Alvaro Uribe (R) of Colombia and Cristina Fernandez de Kirchner of Argentina arrive for the family photo of the Unasur group summit in Bariloche August 28, 2009. Venezuela's President Hugo Chavez is seeking to shore up opposition to a Colombian plan giving U.S. troops more access to its military bases under an accord that has sharply divided South American leaders meeting for a regional summit. The agreement between Washington and its closest Latin American ally has heightened diplomatic tensions and will be the focus of the meeting of South American presidents that starts at this Patagonian lakeside resort on Friday. Reuters Pictures 2 months ago

Presidents Alvaro Uribe (R) of Colombia and Cristina Fernandez de Kirchner of Argentina arrive for the family photo of the Unasur group summit in Bariloche August 28, 2009. Venezuela's President Hugo Chavez is seeking to shore up opposition to a Colombian plan giving U.S. troops more access to its military bases under an accord that has sharply divided South American leaders meeting for a regional summit. The agreement between Washington and its closest Latin American ally has heightened diplomatic tensions and will be the focus of the meeting of South American presidents that starts at this Patagonian lakeside resort on Friday.