Turns out he was right about that but it was cool to just do/think the opposite of whatever he said. The Germans laughed it off as if it "could never happen". Turns out it could and did all within a year.
Trump was not uniquely correct about this. Obama warned Europe about this same thing.
It doesn’t make sense to refer to that guy on Russia/nato when the only time he was right was when it happened to give him a way to criticize a country he hated, while turning around and fawning over the Russian leader when not talking about Germany.
It doesn’t make sense to bring up trump here unless one simply can’t get over trump. There’s plenty of others who are far more appropriate like romney who got made fun of for being right on Russia, not someone who showed open appreciation of Russia hacking their political opponents and regularly showed admiration and deference to Putin.