Oil prices rose on Monday (August 25th) as traders weighed concerns that Russian supplies could be disrupted by tighter U.S. sanctions and a Ukrainian attack targeting Russian energy infrastructure. Brent crude futures rose 40 cents, or 0.6%, to $68.13 at 12:00 GMT, and West Texas Intermediate (WTI) crude futures rose 44 cents, or 0.7%, to $64.10. "The market is somewhat concerned that these peace negotiations will not bear fruit," said Ole Hansen, head of commodity strategy at Saxo Bank. "The market expects supply to exceed demand in the autumn months, but in the short term, it is being...