Three North Koreans have been charged by US authorities over a scheme to steal and extort more than $1.3bn (£940m) from banks and businesses around the world.
They are also accused of deploying malicious cryptocurrency programs.
A Canadian-American citizen was also charged with money laundering.
The men are also accused of being part of the Wannacry cyber-attack of 2017, which crippled UK health service computer systems on a national scale.
