Because then nothing protects members from Russia. If two NATO members go to war, there is no clear side to take.
Also, Russia does not want to join. They want the USSR back
Also, Russia does not want to join. They want the USSR back
No, they don't, and I don't understand why people (Americans in particular?) seem to think this. Is it just nostalgia for the first Cold War?
And that weakness comes from the complete lack of the political culture needed for a functional democracy. The elite of the Russian empire that had a prototypical form of that culture had been eradicated by the communists, and about 10 years of relative lack of authoritarianism in the 90s and early 2000s wasn't nearly enough to form even a semblance of such culture. An ordinary Russian doesn't know what separation of powers is for, how freedom of speech/expression protects their interests, that it's their taxes that Putin spends, not government's money, the norms of civil debate, the individualist thinking etc etc.
In his recent easy he claimed Ukrainians and Russians are the same nation
In fact there was such a historical precedent. Turkey and Greece, both NATO members, fought a war in Northern Cyprus in 1974 [0].
[0] https://en.wikipedia.org/wiki/Turkish_invasion_of_Cyprus