PARIS, Jan 7 - France is working with partners on a plan over how to respond should the United States act on its threat to take over Greenland, a minister said on Wednesday, as Europe sought to address U.S. President Donald Trump's ambitions in the region.

A U.S. military seizure of Greenland from a longtime ally, Denmark, would send shock waves through the NATO alliance and deepen the divide between Trump and European leaders.