Jan. 20 (UPI) -- U.S. warplanes of the North American Aerospace Defense Command will soon arrive in Greenland for planned activities, the bi-national defense organization involving the United States and Canada said Tuesday, as President Donald Trump threatens the sovereignty of the autonomous island.

The aircraft of the United States and Canada were scheduled to arrive at Pituffik Space Base, a U.S. Space Force base, in Greenland in support of "various long-planned NORAD activities, building on the enduring defense cooperation between the United States and Canada, as well as the Kingdom of Denmark," NORAD said in a statement posted to X.

"This activity has been coordinated with the Kingdom of Denmark, and all supporting forces operate with the requisite diplomatic clearances," it added.

"The Government of Greenland is also informed of planned activities."

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