Oil futures rose sharply early Friday, trading at their highest since October with support tied to cold weather in the U.S. and elsewhere and supply concerns.

Oil prices jumped more than 3% on Friday as the U.S. Treasury Department announced sweeping sanctions against Russia's oil industry. Brent gained $2.82, or 3.67%, to $79.74 per barrel by 10:32 a.m. ET, while U.S. crude oil advanced $2.89, or 3.91%, to $76.81 per barrel.

Oil prices rallied more than 4% on Friday to reach their highest levels since October as traders focused on potential supply disruptions from more sanctions on Russia. Brent crude futures gained $3.50,