Financial Times front page on Wednesday, 7 September 2022 has the new PM and the UK energy crisis and immediately underneath is a report on the yen weakness.

USD/JPY is circa 142.80 as I post.

There is market wariness of intervention around these sorts of levels:

At the very least you can expect some strident comments out of Japanese officials today on the rapid yen move not being desirable.

boj yen low collapse 07 September 2022