The 225-issue Nikkei Stock Average added 419.43 points, or 1.65 percent, from Friday to 25,805.30, marking its highest intraday level since June 4, 1991.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 23.76 points, or 1.40 percent, at 1,726.98.
Marine transportation, air transportation and real estate issues comprised those that increased the most by the morning break.
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