This is really a childishly stupid thing for him to have said (right up there with loose-lips Biden calling for Putin to be removed from power).   The West is afraid of nuclear war, as everyone in their right mind should be, including Zelensky.  Surely Zelensky knows this is why he isn't getting more military help:  does he really think taunting like this helps his cause or his people?   Given that neither NATO nor the U.S. will (we hope) take any action that risks nuclear retaliation, perhaps Zelensky needs to rethink his strategy vis-a-vis Moscow?

ADDENDUM:  Greenwald on a related theme.  (Thanks to S. Wallerstein for the pointer.)