BBC:
South Korea, Japan and the US have agreed to work together to increase pressure on North Korea to give up its nuclear weapons.
The deputy foreign ministers of South Korea, Japan and the US made the announcement after meeting in Tokyo.
It comes after top US intelligence official James Clapper said that North Korean denuclearisation was “probably a lost cause”.
North Korea carried out its fifth and largest nuclear test in September.
It also claims to have made rapid progress developing long-range rockets, which could be used to strike the American mainland.
