Ukraine

Nobody in their right mind considers it. It's just a global game of chicken, and some weird armchair strategists try to convince everyone that nuclear attacks are basically the first option on the table.

And I sometimes suspect, that this sentiment gets pushed by Russia (not created, but pushed), because the western fear of nuclear war is definitely an argument against delivering weapons. Especially here in Germany, literally every single new weapon system was considered to "cross a line", so Russia might attack if we send it.