West Texas Intermediate headed for the first weekly loss in three weeks and its discount to Brent widened as crude stockpiles expanded to an 83-year high in the U.S., the world’s biggest oil consumer. Futures were little changed in New York today and down 2.3 percent this week, the most in more than a month. Crude inventories have increased to 397.7 million barrels, the highest since 1931, Energy Information Administration data show. WTI traded as much as $8.57 a barrel below Brent in London as Russia ’s military began drills near the border with Ukraine , prompting U.S. Secretary of State John Kerry to warn that it could be making “an expensive mistake.” “The expanding stockpiles in the U.S. further widens the spread between Brent and WTI,” Will Yun, a commodities analyst at Hyundai Futures Co. in Seoul , said by phone today. “U.S. crude supplies are expanding, which […]