Oil prices jumped around 2.5% on Thursday, extending gains from the previous session, as supply concerns resurfaced after the United States imposed sanctions on major Russian oil suppliers Rosneft and Lukoil over the Ukraine war. Brent crude futures were up by $1.56, or 2.49%, at $64.15 per barrel by 0303 GMT, while U.S. West Texas Intermediate crude futures were up $1.53, or 2.62%, at $60.03.