Japan’s finance ministry has called on X, formerly known as Twitter, to take down an account impersonating its top currency diplomat Masato Kanda.
Mr Kanda is a key figure in efforts by the world third largest economy to stabilise the value of the yen.
Mr Kanda is an influential voice amongst Japan’s monetary policy makers.
The account, which was followed by around 550 users, had not made comments on the yen or financial markets, according to the Reuters news agency.
There had been five posts on the account, with the most recent appearing to impersonate Mr Kanda’s trip to Ukraine earlier this week, the agency reported.
The yen has long been seen as a safe haven in the global financial markets, which investors traditionally bought at times of crisis.