9 September 2016, 12:00 GMT
MOSCOW (Sputnik) — A fifth test, North Korea's strongest nuclear experiment so far, is believed to have been carried out at the country's northeastern nuclear test site overnight. It was registered by monitoring services as a moderate earthquake.
"We all want to condemn strongly this kind of needless provocation," Johnson said, as quoted by Sky News broadcaster.
Later in the day, Johnson added in a statement published by the Foreign Office that he held phone consultations with his Australian and Japanese counterparts Julie Bishop and Fumio Kishida on a "robust response" to the North Korean test.
