Yen extends gains for second day, euro stung by Juncker

* Yen extends rebound after comments about its ‘excessive weakness’. * Dollar/yen briefly breaks below key retracement level. * Eurogroup president Juncker says euro is ‘dangerously high’. * Euro pulls back from multi-month peaks vs USD, yen. * Dollar/yen falls 0.5 pct, euro/dollar down …

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Yen extends gains for second day, euro stung by Juncker