There are sanctions on Venezuelan oil due to the drug trafficking. The oil tankers are captured to punish violations of the sanctions. We don’t capture and appreciable amount of oil this way. And in fact the sanctions drive up the price of oil.
Anyway be clear, I'm talking about this administration. Specifically their choice to invade Venezuela and capture their head of state, while simultaneously pardoning the ex-Honduran head of state who was convicted for the exact same thing. When I say inconsistent, I mean: they are saying (vocally and militarily) that they are anti-drug cartel, but also they are apparently pro-some-cartels? It makes no sense to me.
I agree that tariffs and economic sanctions are similar. But tariffs are in theory targeted at economic conduct that affects us. While sanctions are used to police the moral behavior of other countries, which I don’t support.