Oil is now below $ 65 a barrel. When oil was at $100 a barrel there were food shortages in Venezuela (that is all you really need to know about socialism).
When oil was riding high, Hugo went on a spending spree. As oil drops, those bill are coming due. I read somewhere that Venezuela needs oil to be something like $95 a barrel to meet their balance of payments.
About those Russians fighter jets you bought Hugo -- I am pretty sure Vladimir does not take Visa.
I really am not that worried about Venezuela these days