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President Donald Trump has threatened to annex Greenland, highlighting U.S. national security concerns over Russian and Chinese naval activities, which has raised alarms about NATO's stability. Denmark's Prime Minister Mette Frederiksen cautioned that such a move could jeopardize the alliance, as Greenland is part of Denmark and thus under NATO's collective defense. The situation underscores significant geopolitical tensions and the complexities of U.S.-European relations.