"We will always be there for Japan". With these words, the President of the United States, Donald Trump, explained his government's intervention at the beginning of August to curb the fall in the yen, the Japanese currency, in the markets. The declaration of support and friendship, however, has been followed by certain tensions between him and the Asian country's Prime Minister, Sanae Takaichi, as the White House considers that she is not doing enough to stop the decline of her currency.