Ros Atkins on...Trump's threats to Greenland

France and Germany person warned that borders indispensable not beryllium altered by unit - aft Donald Trump refused to regularisation retired subject enactment to instrumentality Greenland, which is controlled by Denmark.

The president-elect reiterated his tendency to marque the territory portion of the United States. But wherefore does helium privation it?

The BBC's Analysis Editor Ros Atkins explains.