Oil futures were up strongly Monday, with Brent crude on track for its first finish above $80 a barrel since August, as investors assess the potential hit to supply from a further tightening of sanctions on Russia’s oil sector.

Oil prices climbed about 2% to a four-month high on Monday on expectations that wider U.S. sanctions on Russian oil would force buyers in India and China to seek other suppliers.

Crude oil prices surge as U.S. sanctions on Russian oil disrupt global supplies, driving Brent crude above $81/bbl to the highest in nearly five months.