Jeremy Hunt, the Foreign Secretary of the UK, taught English in Japan in the early 1990s while he was learning Japaense there.

“I taught English out there [in Japan], but my main purpose was to learn the [Japanese] language. I struggled every day to master the writing system — you need to learn 3,000 characters to read a Japanese newspaper”

https://www.japantimes.co.jp/news/2018/07/10/national/politics-diplomacy/new-foreign-secretary-jeremy-hunt-fluent-japanese-speaker-drew-years-japan-become-one-u-k-s-richest-politicians/

Mr. Hunt, who was appointed to the UK foreign secretary in 2018, gave a new year message to Japan in fluent Japanese in 2019.