What will Europe actually do to defend Greenland?

European countries - including France - have begun deploying troops to Greenland, in what Germany describes as a mission aimed at countering 'Russian and Chinese threats'. The White House says the show of unity for the Arctic island will have 'no impact' on Trump's ambitions for it. It comes a day after high-level talks in Washington highlighted 'fundamental disagreements' over the future of the Danish territory.