Tokyo stocks dropped sharply Thursday, with the Nikkei stock index ending over 2 percent lower, as a sell-off accelerated after U.S. President Donald Trump's speech rekindled concern that the Iran war would drag on.The 225-issue Nikkei Stock Average ended down 1,276.41 points, or 2.38 percent, from Wednesday at 52,463.27. The broader Topix index finished 59.23 points, or 1.61 percent, lower at 3,611.67.On the top-tier Prime Market, the main decliners were oil and coal product, insurance and nonferrous metal issues.The U.S. dollar strengthened to the mid-159 yen range in Tokyo amid a renewed…READ FULL ARTICLE