President-elect Donald Trump is inheriting a blood-soaked war in Ukraine. He has pledged to put a swift end to the carnage.Mr. Trump hasn’t explained his plan — if, indeed, he has one — but Vice President-elect JD Vance has called for Ukraine to cede captured land to Russia and drop its pleas to join NATO in exchange for peace. Mr. Trump’s national security adviser nominee, Representative Michael Waltz of Florida, has criticized the flow of U.S. aid to Ukraine and called for prompt negotiations, questioning whether the United States should support the complete liberation of Ukraine.If Mr. Trump follows their...