HELSINKI — On the eve of his meeting with Russian President Vladimir Putin, President Trump on Sunday described the European Union as a trading “foe,” further unnerving some of America’s closest partners after disruptive visits to NATO headquarters and the United Kingdom. Trump has not said what he hopes to gain Monday from four hours of scheduled talks with Putin – including 90 minutes without any note-takers or aides – in Finland’s main presidential palace. “I don’t expect anything,” he said on CBS shortly before he left Scotland for Helsinki.