Energy shares fell, with Chevron Corp CVX.N and Exxon Mobil XOM.N down 2.2% and 0.4%, respectively. By Devik Jain and Sabahatjahan Contractor March 11 (Reuters) - U.S. stock index futures jumped on Friday after Russian President Vladimir Putin said there were "certain positive shifts" in talks with Ukraine, lifting mood at the end of a roller-coaster week marked by concerns about geopolitical tensions and surging oil prices. O/R But the soaring oil prices fed into fears of higher inflation and slowing economic growth at a time when global central banks are seeking to tighten their pandemic-era monetary policies.