CNN  —  The residence of the Argentine ambassador in Caracas, Venezuela, is mostly silent these days. Rather than diplomatic chatter or Christmas carols at this time of the year, the only noise is that of a small diesel power generator the residents turn on twice a day to charge their phones. The rest of the time, the mansion sits almost still, the occupants busy with their own solitary tasks, like an oversized prison with few inmates. There are no diplomats inside the compound – the Venezuelan