U.S. stock futures were fluctuating on Tuesday following a mixed close on Monday. Futures of major benchmark indices were mixed. President Donald Trump expressed readiness to host a trilateral meeting with Russian President Vladimir Putin and Ukrainian President Volodymyr Zelenskyy to end the three-year-long war in Ukraine. Meanwhile, investors will focus on the earnings from top U.S. retailers, including Home Depot Inc. HD today, Target Corp. TGT on Wednesday and Walmart Inc. WMT on Thursday. The 10-year T ...