Trump is hailing his new deal with Greenland and Denmark — but a deal already existed. So what changed?

<img src='https://i.cbc.ca/ais/cc6a513e-3d13-440f-b252-20ba0828d4c9,1790118391188/full/max/0/default.jpg?im=Crop%2Crect%3D%280%2C0%2C1920%2C1080%29%3B' alt='three people strike a deal' width='620' height='349' title='US President Donald Trump reacts after the trilateral signing event regarding a deal on Greenland&apos;s security.'/><p></p>