As of 9:15 a.m., the 225-issue Nikkei Stock Average gained 176.14 points, or 0.76 percent, from Friday to 23,289.02.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, added 11.74 points, or 0.69 percent, at 1,703.08.
Mining, marine transportation, and oil and coal product-linked issues comprised those that gained the most in the opening minutes after the morning bell.
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