Sign up for the Slatest to get the most insightful analysis, criticism, and advice out there, delivered to your inbox daily. Back in December, during his transition to the White House, I wrote, “Donald Trump probably isn’t a Russian agent, but he wouldn’t be behaving much differently if he were.” I was sneering a bit when I typed that out two months ago. Now I’m scowling. Things have become very serious. Trump’s obeisance to Vladimir Putin’s views has raised suspicions on many occasions over the past decade, but his outright kowtowing remarks at a news conference Tuesday were enough to...