Former national security adviser Robert O’Brien said in a Sunday interview that Denmark should let the U.S. “buy” Greenland if it cannot defend the self-governing country, noting the territory will become increasingly important in the coming years.

In an interview on Fox News’s “Sunday Morning Futures,” O’Brien described Greenland as a “highway from the Arctic all the way to North America” and noted that the autonomous country, which is part of the Kingdom of Denmark, will become increasingly important as the climate warms in the coming years.

“It's strategically very important to the Arctic, which is going to be the critical battleground........

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