U.S. stock futures declined on Wednesday following Tuesday's mixed trading. Futures of major benchmark indices were lower. The S&P 500 and Nasdaq 100's retreat came as peace talks between President Donald Trump, Ukrainian President Volodymyr Zelenskyy, and European leaders failed to deliver a breakthrough. After Home Depot Inc. HD, investors await Target Corp.'s TGT earnings today and Walmart Inc.'s WMT on Thursday. Investors are also focused on the Federal Reserve Chair Jerome Powell's speech later this we ...