Greenland is not for sale, Danish Prime Minister Mette Fredriksen said on Monday, after U.S. Secretary of State Marco Rubio said last week that President Donald Trump's interest in acquiring the island was "not a joke".

Denmark's prime minister reiterates 'Greenland is not for sale':: Brussels, Belgium:::: Mette Fredriksen, Danish Prime Minister "Everybody has to respect the sovereignty of all national states in the world and that Greenland is today a part of the Kingdom of Denmark,

Greenland is a self-ruling territory in the Danish kingdom, which means policymakers in Nuuk control most domestic issues. Denmark, which oversees defense and security policy on the mineral-rich Arctic island, is injecting 14.6 billion kroner ($2 billion) to ramp up defenses.