The rules-based world order "no longer exists", German Chancellor Friedrich Merz has warned world leaders at a major security summit.
Opening the annual Munich Security Conference, he said "our freedom is not guaranteed" in an era of big power politics, and Europeans must be ready to make "sacrifice".
Merz also admitted that "a deep divide has opened between Europe and the United States" - an apparent reference to US President Donald Trump's threat to Denmark's sovereignty by pledging to annex Greenland and his tariff policies towards other European nations.
US Secretary of State Marco Rubio, who was listening to Merz and will deliver his own speech on Saturday, earlier spoke of a "new era in geopolitics".
Some 50 world leaders are expected to attend this year's conference, where European defence and the future of the transatlantic relationship will be discussed.
