IIRC, it was NATO that signed an agreement that they won't expand to the east when Russia / USSR agreed to withdraw its army from the East Europe.
It was the Russia / USSR that agreed to let Ukraine alone as long as they guarantee human rights and equal status of ethnic Russian / Russian-speaking minority in Ukraine (but majority in East Ukraine and Crimea).
It was the Russia and USA that agreed to restrict usage of the nuclear missiles in Europe.
Guess who broke all those treaties and agreements and now has balls to accuse the opposite party for the current situation.
Even thousands of years ago, Sun Tzu said you should not push your enemy to the wall where his only choice is to fight to death or just die, and NATO is still doing that.
It's not how you de-escalate things, and I hope the reason would overcome, unless we want to experience a nuclear winter.