CARACAS (AFP) - Venezuela plunged into political uncertainty Monday after the government announced that President Hugo Chavez had suffered a new setback after cancer surgery in Cuba and the situation he was facing was “tough.” “We have been informed of new complications that arose as a consequence of the respiratory infection we already knew about,” Vice President Nicolas Maduro said Sunday in a TV and radio broadcast from Havana, where Chavez underwent his operation. Cuba is Chavez’s closest regional ally. “President Chavez’s condition is still delicate,” Maduro added, warning that the complications “are being treated in a process that is not without its risks.”