The Nikkei share average fell to a one-week closing low on Monday as a firmer yen added to woes for automakers and other exporters, which have been under pressure from growing tension between Japan and China.

Concerns about global growth weighed on the market even though major central banks have launched fresh stimulus measures to bolster their economies. Some analysts now worry that the new round of stimulus from the Federal Reserve suggests that the US economy is in worse shape than many had feared.

Struggling chipmaker Renesas Electronics Corp jumped 31 percent after two sources said a Japanese government fund was part of a consortium including Toyota Motor Corp considering a bailout of the company, countering a bid by private equity firm KKR.

The Nikkei eased 0.5 percent to 9,069.29 points , supported by the 200-day moving average at 9,016.86, while the Nikkei China 50, made up of Japanese firms with heavy exposure to the world's second largest economy, shed 1.3 percent.