Denmark launched its presidency of the European Union on Thursday with a call for Europe to unite to take on war in Ukraine and chaos caused by U.S. President Donald Trump's global tariff hike which are likely to mark the Nordic country's six-month term at the helm of the world's biggest trading bloc.

If the United States were to not give Ukraine the military support it needs, it would be a serious setback for Ukraine, the EU and NATO, Denmark's Prime Minister Mette Frederiksen said on Thursday.

Ukrainian President Volodymyr Zelenskyy is in Denmark as the Nordic country launches its European Union presidency. Zelenskyy flew into the western city of Aarhus on Thursday. A Ukrainian flag