Tatsuo Yamasaki is a former Japanese vice minister of finance for international affairs.
He spoke with Japanese media, Nikkei, saying Trump would do well to cooperate with Tokyo on weakening the overly strong dollar.
USD/JPY non-responsive:
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Yamasaki is a former Finance Ministry's Vice Finance Minister for International Affairs Kanda. That is the official who will instruct the BOJ to intervene in FX, when he judges it necessary. Often referred to as Japan's 'top currency diplomat'.