Brand's mission is the latest in a string of endurance tests carried out by celebrities for Sport Relief.
North Korea, which conducted its fourth nuclear test in January and a string of rocket tests since then, regards the joint exercises as akin to war and has threatened to launch a military strike in retaliation.
In the autumn a string of positive tests for Astana and its feeder team was followed by a drawn-out, contorted battle with cycling's world body, the UCI, over whether the team should be stripped of its World Tour licence on ethical grounds.
The North Koreans say they are all dead.Since failed attempts at normalising ties in 2002 and 2004, and a string of nuclear tests by North Korea, relations have turned toxic once again.
In 1998 India and Pakistan both declared themselves to be nuclear powers with a string of nuclear tests.
A string of blood tests ensue and dengue fever is confirmed.
James Mattis, Trump's choice for Defense Secretary, was even allowed to keep four hundred thousand shares of stock in Theranos, the controversial Silicon Valley blood-test manufacturer that, in a string of lawsuits, has been accused of securities fraud and endangering the health of its customers.
