U.S. equity futures are pointing sharply lower Tuesday morning as renewed trade tensions and cautious positioning ahead of bank earnings put investors back on the defensive. The S&P 500 is off 66 points (-0.99%), Nasdaq futures down 321 points (-1.30%), Dow futures lower by 259 points (-0.56%), and the Russell 2000 weaker by roughly -1.17%. The overnight tone turned risk-off after Beijing imposed sanctions on five U.S. subsidiaries...