WASHINGTON — This is Doomsday prepping, European style. Secret documents revealed Wednesday that Berlin has begun making plans for how it could help deploy as many as 800,000 NATO troops — including Americans — into Ukraine as Russia’s nuclear saber-rattling reaches new heights. “Operation Deutschland” is a 1,000-page plan to prepare Germany for the possibility of a World War III scenario. The top-secret papers reportedly detail specific buildings and infrastructure to protect so they can be utilized by the military, how businesses and civilians should prepare in case of increased threats, according to the German newspaper Frankfurter Allgemeine Zeitung. They...