Tensions involving the US? Because the combination of the US and Canada has been self-sufficient in petroleum for a few years now: i.e., the US need go no further than Canada to get all the oil it needs. The US would be self-sufficient now if the Saudis hadn't lowered their prices about 6 years ago in an explicit attempt to discourage US production; as it is, US self-sufficiency will take a few more years.

Now that the US has the technical means to extract "tight oil" just the state of Texas has enough extractible oil to last the US 100 years, I saw one expert say recently.

(Of course, burning all that oil would cause horrible climate change, but that is true of the Iranian oil, too.)