As of 9:15 a.m., the 225-issue Nikkei Stock Average added 289.08 points, or 1.30 percent, from Friday to 22,579.89.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 22.37 points, or 1.46 percent, at 1,557.57.
Iron and steel, mining and nonferrous metal issues comprised those that advanced the most in the opening minutes after the morning bell.
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