

Russia knows that invasion of a NATO country is the start of WW3. That´s why they attacked Ukraine before they entered NATO.
I don’t believe they will exit. I believe that is their move to stop their front with Russia, concentrating to China (sacrificing Ukraine with the worst way possible, i mean Brutus is looking as an innocent guy in front of USA), and EU will increase dramatically their Army budget, something USA was begging for decades. And after the Trump era they will go back normal and act like nothing ever happened.
Europe is panicking (both people and politicians) and acting without a plan right now.
Yeah never thought of that. Although i believe there are treaties prohibiting Germany to posses nuclear weapons. So i guess the only option for the nukes would be something with EU leadership in play.