Tokyo stocks tumbled on Wednesday, with key indexes falling more than 3 percent to one-month lows amid a global sell-off driven by growing concerns over the conflict in the Middle East and surging oil prices.The 225-issue Nikkei Stock Average ended down 2,033.51 points, or 3.61 percent, from Tuesday at 54,245.54. The broader Topix index finished 138.50 points, or 3.67 percent, lower at 3,633.67.On the top-tier Prime Market, the main decliners were oil and coal product, nonferrous metal and wholesale trade issues.The U.S. dollar briefly weakened to the lower 157 yen range in Tokyo after Fina…READ FULL ARTICLE