[oxff]

> The expectation that the result of "letting it happen" ...

EU and USA are letting it happen though: there is no military deployment to Ukraine to protect it, and (my guess is) there will not be.

[ceejayoz]

There's a whole spectrum of actions between "do nothing" and "open hot war between nuclear powers". It's quite clear Western military aid, intelligence, and diplomatic support has been critical to Ukraine in the current conflict.