South Korean stocks fell Tuesday as investors sat on the sidelines following sharp gains the previous session, with US President-elect Donald Trump vowing tariffs on imports from Canada, Mexico and China. The local currency rose against the US dollar. The benchmark Korea Composite Stock Price Index shed 13.98 points, or 0.55 percent, to close at 2,520.36, ending a two-day winning streak. Trade volume was moderate at 434.77 million shares worth 8.51 trillion won (US$6.09 billion), with winners ou