[wiseowise]

Good example, US didn’t invade under DIRECT threat of nuclear missiles on Cuba’s soil.

Ukraine signed Budapest memorandum in 1994 and willingly gave up nukes for security assurances (ironically Russia is one of the guarantees).

[d0mine]

There was no invasion because Soviets removed Cuban missiles and Kennedy promised to remove U.S. missiles from Turkey (the missiles being there is the reason for the crisis in the first place).

[wiseowise]

QED.

[d0mine]

This time It is unlikely that NATO stops the bully-favorite "did you step on my foot" game.

So there is no choice for Russia: fight or be dismembered.