By “crossing the red lines” do you mean ex-Eastern block countries joining NATO? Those countries joined out of their own free will BECAUSE they feared Russia might want to attack them. And, oh surprise, Russia did attack the one country not sucking up to them that didn’t join NATO. Why should Russia’s security be sacred above that of all its neighbours?
If by red lines you don’t mean that, then they’ve clearly not been crossed. Russia and US or EU troops have not directly fought each other, and no country has used nuclear weapons so far.
By “crossing the red lines” do you mean ex-Eastern block countries joining NATO? Those countries joined out of their own free will BECAUSE they feared Russia might want to attack them. And, oh surprise, Russia did attack the one country not sucking up to them that didn’t join NATO. Why should Russia’s security be sacred above that of all its neighbours?
If by red lines you don’t mean that, then they’ve clearly not been crossed. Russia and US or EU troops have not directly fought each other, and no country has used nuclear weapons so far.