By LARA JAKES An explosive-laden drone at a German airport. A strike on a passenger train near the Polish border. A rush of warnings about more chaos to come. If President Vladimir Putin of Russia was hoping to heap pressure on Ukraine’s closest allies, he’s succeeded with a series of provocations that Western officials have blamed on Russia and said could put citizens of NATO countries in danger. The question is how Europe responds. In the past week, European leaders have spoken with…
