This aerial view shows icebergs floating in the waters beaten down by the sun with buildings in the background off Nuuk, Greenland, on March 11, 2025. Any US attack on a NATO ally would be the end of "everything", Denmark's Prime Minister Mette Frederiksen warned on January 5, 2026, after US President Donald Trump repeated his desire to annex Greenland. "If the United States decides to militarily attack another NATO country, then everything would stop -- that includes NATO and therefore post-World War II security," Frederiksen told Danish television network TV2.