That man is a genuine threat to the European Union, Europe as a continent and the Western world as we know it.
As an European, I used to think of an 'European army' as a stupid idea, but now I think it has become a necessity to ensure the security of Europe. We can no longer rely on the US to be a reliable ally. Whether it's about supplying arms, maintaining military hardware or coordinating military exercises, they should no longer be trusted. Why? Because this guy is crazy enough to provide Putin with all the highly sensitive data on European defenses. He'll probably tell Putin where all the (secret) military bases are located, where the anti-air defenses are placed, and how the defenses work. He's a traitor to the NATO alliance and a threat to the security of Europe.