MINSK - Belarusian President Alexander Lukashenko said on Tuesday the conflict in eastern Ukraine could not be resolved without U.S. involvement in peace talks. A diplomatic breakthrough last week potentially opened the way for an international summit between France, Germany, Russia and Ukraine aimed at finding a way to end the fighting. 'It won't be possible to resolve the conflict without the participation of the United States,' Lukashenko said. Belarus is a close ally of Russia.