Putin's regime wanted heavy-handed control over its neighbors; and the Maidan revolution demonstrated not only that this control wasn't as strong as it appeared, but also that it might be possible to break free from that oppression for others too, including perhaps Russian's. That example was the threat from which Putin was "defending" himself.
As much as Chomsky's well-reasoned talks are worth respect, he never really addressed that well. Putin's defense vs. the NATO threat was about as reasonable as a colonial power's "defense" vs. their subject's freedom; and it's also being executed about as reasonably, too. But to hear Chomsky describe it this is basically irrelevant; anything opposed to American overreach is reasonable - even when it's clearly not, and it's not even clear there's any overreach in the matter at hand.