Tokyo stocks ended 0.35 percent lower on Monday, weighed by instability of Ukraine and the yen's appreciation against the euro.
The 225-issue Nikkei Stock Average was down 50.07 points, from Friday at 14,149.52.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange lost 7.60 points, or 0.65 percent, at 1,157. 91.
Decliners were led by rubber, mining and nonferrous metal shares.
The turnover was 1607.6 billion yen (15.77 billion U.S. dollars) .