Pundits claim that if Donald Trump is re-elected, he will cut off aid to Ukraine, give away its territory, and deal directly with Vladimir Putin to impose an ignominious “peace” on the country. There’s no evidence that such capitulation will be part of President Trump’s policy and much evidence to the contrary. It was Mr. Trump who in 2017 lifted the Obama administration’s arms embargo on Ukraine, providing it with the Javelin missiles that helped save Kyiv in the earliest days of Russia’s invasion. More recently, Mr. Trump gave political cover to House Speaker Mike Johnson when he maneuvered to...