Denmark has implemented a special “night watch” in its foreign ministry in Copenhagen in response to U.S. President Donald Trump’s threats to annex Greenland, the semi-autonomous Danish territory, according to a new report released Wednesday.

The United States will reassert its dominance in the Western Hemisphere, build military strength in the Indo-Pacific, and possibly reassess its relationship with Europe, President Donald Trump said on Friday in a sweeping strategy document that seeks to reframe the country's role in the world.

Europe faces "civilisational erasure" and must change course if it is to remain a reliable ally for the United States, according to a U.S. National Security Strategy posted on the White House website.

The Trump administration's newly released National Security Strategy details potential dangers for Europe in the next 20 years. CBS News' Natalie Brand reports.