OSLO/BRUSSELS - Danish Prime Minister Mette Frederiksen and Greenlandic Prime Minister Jens-Frederik Nielsen said on Monday that they expect respect for the Kingdom of Denmark's territorial integrity from the US side.

"We have said it very clearly before. Now we say it again. You cannot annex other countries. Not even with an argument about international security. Greenland belongs to the Greenlanders, and the USA should not take over Greenland. We expect respect for our common territorial integrity," the two leaders said in a joint statement.

The remarks came after US President Donald Trump announced late Sunday the appointment of Louisiana Governor Jeff Landry as the US special envoy to Greenland, renewing diplomatic tension between Washington and the Danish Realm.

"Jeff understands how essential Greenland is to our National Security, and will strongly advance our Country's Interests for the Safety, Security, and Survival of our Allies," said Trump on social media platform Truth Social.

Landry wrote on social media X that it was an honor to serve in the role "to make Greenland part of the USA".

ALSO READ: Danish PM slams alleged US interference in Greenland as ‘unacceptable’

Danish Foreign Minister Lars Lokke Rasmussen said Denmark would summon US Ambassador Kenneth Howery for talks, demanding respect for the territorial integrity of the Kingdom of Denmark, which includes Denmark, the Faroe Islands and Greenland.

"I am upset, especially about the envoy's statements about making Greenland part of the United States. We find that completely unacceptable," Rasmussen told Danish broadcaster TV 2.

Earlier in the day, Rasmussen said in a written statement to Danish broadcaster DR that while the appointment underscores continued American interest in the Arctic island, "everyone, including the US, must show respect for the territorial integrity of the Kingdom of Denmark."

Meanwhile, when asked about the US move, an EU spokesperson said Denmark's territorial integrity and sovereignty, including over Greenland, must be preserved.

"Preserving the territorial integrity of the Kingdom of Denmark, its sovereignty and the inviolability of its borders is essential for the European Union," EU Foreign Affairs spokesperson Anouar El Anouni told a press conference, adding that the bloc's stance is grounded in a long-standing position on the issue.

Since taking office in January this year, Trump has repeatedly expressed interest in gaining control of Greenland, stating he would not rule out the use of "military or economic coercion" to achieve that goal.

READ MORE: Report: Danish foreign minister summons US diplomat over Greenland

Greenland, a former Danish colony, became an integral part of the Kingdom of Denmark in 1953. It was granted home rule in 1979, expanding its autonomy, though Denmark retains authority over foreign affairs and defense.