Oil futures ended sharply higher on Friday, as fresh U.S. sanctions on Russia’s oil sector looked to threaten global supplies and as winter storms in the U.S. were expected to boost demand for heating fuels.

Oil prices jumped more than 4% on Friday, with global benchmark Brent breaking $80 per barrel for the first time since October on fears that tougher U.S. sanctions on Russia will disrupt crude supplies.

The White House, now unconcerned about the effect on gas prices and inflation, blacklisted two of Russia’s biggest oil producers and nearly 200 tanker ships.