Trump again having designs on Greenland comes after the president-elect suggested over the weekend that the U.S. could retake control of the Panama Canal if something isn't done to ease rising shipping costs required for using the waterway linking the Atlantic and Pacific oceans.

The Danish Defence Ministry announced on Tuesday a massive new defence expenditure centred on Greenland, the Arctic territory rich in minerals and natural resources that Copenhagen lays claim to and which US President-elect Donald Trump covets.

President-elect Trump has revived calls for the United States to buy Greenland and complains of high fees at the Panama Canal. Some experts say his words hark back to an aggressive style he used in business.