By Erwin Seba (Reuters) - Oil prices rose on Friday after a Ukrainian drone attack suspended loadings from the largest port in western Russia, but gains were capped by concerns about U.S. demand. Brent crude futures settled at $66.99 a barrel, up 62 cents, or 0.93$62.69, a gain of 32 cents, or 0.51%. Early in the day, crude reacted to the drone attack on Russia's northwestern port of Primorsk, which led to a suspension of oil loading operations overnight ...