Yesterday's strong yen outperformance has pushed the CNH/JPY cross back sub 21.00. This puts the pair back below all of its key EMAs, see the chart below. The last time this occurred in Dec last year, we saw the cross test sub 20.50 before sentiment stabilized.
Fig 1: CNH/JPY Back Sub All Key EMAs

SOurce: MNI - Market News/Bloomberg
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As USD/JPY tests above 158.00, focus is likely to rest on how the authorities react. In the aftermath of the on hold Dec BoJ meeting outcome and subsequent yen weakness, we saw official rhetoric rise around FX moves.
Fig 1: USD/JPY Versus US-JP Government Bond Yield Differentials

Source: MNI - Market News/Bloomberg
Early G10 FX trends are skewed in favour of the USD, with the yen continuing to underperform. The BBDXY index is up around 0.10%, to 1305.6 at this stage, so only recovering a small proportion of Monday's 0.60% drop.