>That seems to me to be essentially the same thing
Tariffs are not the same as nationalization; they are merely a tax/duty on imports (or exports).
Yes they can be abused, but that is true of almost all powers.
It is essentially telling private companies where they can sell their product by penalizing them if they sell on the international market ... meanwhile other oil companies would be free to sell on the international market.
Also, unless we also set domestic prices (which would be tantamount to nationalizing) the price of oil would not be cheaper domestically.
Now, maybe that’s the way we’ll have to go. But I’m just making the point that oil is not going to be cheaper by strong-arming companies to sell domestically.