A former Russian energy minister on Friday dismissed concerns U.S. shale oil companies may try to use production cuts by Russia and nations in the Middle East to swoop in and steal market share, saying the Americans know there are some no-go zones. Igor Yusufov, Russia’s energy minister from 2001 to 2004, said U.S. shale producers wouldn’t attempt to enter core OPEC and Russia markets where prices are too low for them to compete….