Well in most cases trade benefits both parties. Most Latin American countries have involved extended periods of corrupt governmentsd of both left and right persuasions. Uruguay might be an exception: it has enjoyed non authoritarian mildly social democrat goverrnment for a long time and has seen modest growth but stable continuous development. Boom and bust with alternations between left and right wing governments. appears to be the rule for Peru, Brasil and Argentina. I think the situation in Columbia where a functioning goverrnment and economy were beset by the FARC on one hand and the drug Mafia on the other was profoundly different from that in Venezuels, where even under previous regimes the oil riches were the narcotic that inhibited economic development in other areas.
The sad part now is the stupid authoritarian misgovernance of the Chavistas has deprived Venezuela of a major part of their petroleum producction (and in a down market as well) while at the same time destroying productive economic activity in other areas ranging from agriculture , to other industries and even distribition of imported consumer procucts as well. Truly a triumph of authoritarian stupidity. The same thing happened in the Soviet Union though the decay took a bit longer. Even therr the much reported Soviet cynical joke , "We pretend to work and they pretend to pay us" goes back to the 1950s.
I believe Venezuela is now a bit like Cuba. Our best bet is to wait until the citizenry wakes up and takes positive action to restore freedom and productive economic activity.