Japan's peak FX official says will respond firmly to excessive forex moves

Japan's Ministry of Finance's Masato Kanda is its top currency official. Kanda is the official responsible for instructing the Bank of Japan to intervene in the currency (in this case to buy the yen) when he deems it appropriate to do so.

• will firmly respond to excessive FX moves
• each country will take appropriate response following the G7/G20 agreement on FX

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That first comment is significant, "excessive" is a keyword as explained in here:

• Here's what to watch for to warn of imminent Bank of Japan (BOJ) yen intervention

• The 4 things to watch prior to Bank of Japan FX yen intervention

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Japanese intervention to buy yen has been conducted solely by the Bank of Japan, no other central banks have joined for co-ordinated intervention. This is a problem for Japan as all its really done is provided an opportunity for speculators to but the USD/JPY JPY The Japanese yen (JPY) is the official currency of Japan and at the time of writing is the third most-traded currency in the world behind only the US dollar and euro.The JPY is used extensively as a reserve currency and is relied upon by forex traders as a safe haven currency.Originally implemented in 1871, the JPY has had a long history and has survived multiple world wars and other events. This was followed by the creation of the Bank of Japan (BoJ) in 1882 and the full oversight of the JPY by The Japanese yen (JPY) is the official currency of Japan and at the time of writing is the third most-traded currency in the world behind only the US dollar and euro.The JPY is used extensively as a reserve currency and is relied upon by forex traders as a safe haven currency.Originally implemented in 1871, the JPY has had a long history and has survived multiple world wars and other events. This was followed by the creation of the Bank of Japan (BoJ) in 1882 and the full oversight of the JPY by Read this Term dip.