In the opening minutes after the morning bell, the 225-issue Nikkei Stock Average gained 222.07 points, or 1.10 percent, from Friday to 20,401.16.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, added 16.69 points, or 1.14 percent, at 1,474.97.
Air transportation, metal product and nonferrous metal-oriented issues comprised notable early gainers.
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