The yen's surge to its highest level of the year against the dollar has put investors on alert for possible currency intervention by the Japanese authorities this week.
If Japan acts to shield its stock markets and exporters from the rising yen, it will be the first time Tokyo has intervened in the foreign exchange markets since April 2004.
Last week, the yen rose 2.5 per cent to a high of Y86.36 against the dollar, its strongest level since December.
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