Former President Donald Trump called Russian President Vladimir Putin smart and criticized the U.S. response to Russia’s invasion of Ukraine. “I mean, he’s taking over a country for $2 worth of sanctions. I’d say that’s pretty smart,” Mr. Trump said during a fundraiser at his Mar-a-Lago resort in Florida on Wednesday night, according to a recording of the event posted online, contending that Mr. Putin wouldn’t have invaded if he were still president. In a telephone interview with Fox News late Wednesday night, as Russia launched its invasion, Mr. Trump called the unfolding events a “very sad thing for the...