During his campaign, Donald J. Trump vowed to end the Ukraine war by Day 1 of his new term as president. Jeanna Smialek, the Brussels bureau chief for The New York Times, looks at how he described the war in an appearance at the World Economic Forum since taking office.

Knock-on effect: The new rules — which passed by 82 percent in a plebiscite last summer — have had a mixed reaction in Davos, with some residents concerned they could impact the lucrative annual subletting market. (Apartments and shop spaces command rents of thousands of Swiss francs per week during the forum.)

The party scene may be in full swing, but the mood is far from festive as some big political hitters reacted to the head-spinning news coming from Washington following Donald Trump’s inauguration.

C.E.O.s, policymakers and billionaires at the World Economic Forum’s conference have long pledged to fight climate change. Has it done any good?

DAVOS, Switzerland (AP ... to declare a “national energy emergency” will certainly weigh on minds in Brussels. An afternoon talk considers Europe’s defense strategy with Trump reviving ...

DAVOS, Switzerland (AP ... Associated Press writer Lorne Cook in Brussels contributed to this report.