I agree with his conclusion (3 sentences to comply with rules but there is more) but recommend to scroll straight to the end of the article.
The question of why the Trumpian populist right is so consumed with hatred for Ukraine—a hatred that clearly goes beyond concerns about U.S. spending, a very small portion of our military budget, or about the nonexistent involvement of American troops—doesn’t have a simple answer. Partly, it’s simply partisanship: If the libs are for it, we’re against it, and the more offensively the better. (And if the pre-Trump Republican establishment is also for it, then we’re even more against it.) Partly, it’s the belief that Ukrainian democracy is a Biden/Obama/Hillary Clinton/”Deep State” project, all the more suspect because it’s related to Trump’s first impeachment.