RPT-UPDATE 2-Spot crude premiums jump as US sanctions on Russian producers drive China, India demand

(Repeats story with no changes to text) * Mideast benchmark Dubai premium more than doubled to 3-week high * Similar jumps seen in Oman, Murban premiums * China, India to buy more oil from Iraq, West Africa, Brazil By Siyi Liu and Florence Tan SINGAPORE, Oct 23 (Reuters) – Spot premiums in crude markets jumped on Thursday on expectations that U.S. sanctions on top Russian producers will spur China and India's demand for supplies from the Middle East, Africa and South America, trade sources and analysts said. Washington hit major suppliers Rosneft and Lukoil with sanctions over the Ukraine war, sparking concerns over tighter supply of oil from Russia, the top supplier to China and India. Global oil benchmark Brent futures rose by more than 4% on Thursday. Indian refiners and some Chinese co