The yen touched a 16-month peak versus the dollar on Friday as financial markets were hit by concerns over growing U.S.-China trade intensification.
The greenback dropped to as low as 104.635 yen in early trade, its nadir since November 2016.
The dollar index lost 0.3 percent to 89.615 .DXY, set for a weekly loss of 0.7 percent.
The euro inched up 0.3 percent to $1.2334.
In the longer term, protectionist measures imposed by the United States could be eased, in turn limiting the negative impact on trade ties and the world economy, experts say.