Sorry, Venezuela showing mistrust on the USD? They're 100% dependent on the dollar, and blaming the US for their ills is a convenient crutch. In truth they've completely misused their foreign reserves, and overspent on populist "social causes"; not to mention the impact of rampant corruption.
Since Chavez got to power their budget was based on a high (and ever higher) price for their crude, and a stranglehold on outgoing forex and the availability of dollars to the general public, has led to inflation at roughly 60% p.a. and a secondary exchange rate for dollars that has seen the value of the Bolivar halve every 12 months or so. With crude prices dropping, or at least staying below the $95/b that their calcs were based on, the situation gets worse and the pressure on the government increases.