Tokyo stocks opened lower Monday, with exporters hit by the stronger yen against the U.S. dollar after the U.S. Federal Reserve chief’s recent comments on a possible interest rate cut, while Middle East tensions dampened sentiment. In the first 15 minutes of trading, the 225-issue Nikkei Stock Average fell 336.38 points, or 0.88 percent, from Friday to 38,027.89. The broader Topix index was down 22.06 points, or 0.82 percent, at 2,662.66. On the top-tier Prime Market, decliners were led by rubber product, pharmaceutical and transportation equipment issues. At 9 a.m., the U.S. dollar fetched 14…