How U.S. takes action on Venezuelan oil tankers is key, says RBC's Croft

So, how does all of this ultimately though play out. Helma Croft is MD and head of global commodity strategy at RBC Capital Markets. Helma, the key word here, sanction, right.This is not all oil coming Venezuela. It's not from Venezuela. It's not a complete blockade of all of Maduro's oil.So, how much do we think it is. And what kind of damage might it do. >> Well, it's certainly not the 250,000 barrels a day that Chevron exports from Venezuela.So, we're talking about the remainder. Are we talking about 5 t ...