So instead of tariff, it's gonna be a complete halt.
Prior to Saudi Arabia increasing its oil production, less than 10% of its output were sold to the US. In April, Saudi increased production to 12.3 million barrels, of which 600K is for the US (less than 5%).
Russia sells less than 1% of its output to the US.
US's biggest oil importers are Canada and Mexico. So the earlier threat by Trump, the self proclaimed tariff man, to put tariff on oil import has very little effect on either Saudi Arabia or Russia, but will hurt two of US's closest allies.