Jackson Diehl: Whether Putin won in Helsinki remains to be seen

Russian President Vladimir Putin is probably still smirking about the chaos created by President Donald Trump's European tour, which has led thoughtful people on both sides of the Atlantic to conclude that not just NATO but the whole post-World War II liberal order led by the United States is doomed.They may be proved right. But I suspect that before they are, Putin, too, will come to regret the Helsinki summit. More than likely, it has torpedoed the Russian president’s chances of extracti