By Pete Schroeder WASHINGTON (Reuters) -U.S. stocks maintained gains Wednesday even after the Federal Reserve signaled an interest rate hike could be coming soon, while tension between Russia and Ukraine pushed oil prices to highs not seen since 2014. All three major stock indices pared earlier gains but stayed in positive territory Wednesday afternoon after the Fed policy statement, with the tech-heavy Nasdaq leading the way with gains over 2%. The Dow Jones Industrial Average rose 0.65%, the S&P 500 was up 1.30% and the Nasdaq Composite was up 2.19% shortly after the Fed released its stateme…