Why wouldn't russia use a tactical nuke in west Ukraine to destroy tank factories? They already are a international Pariah, that is why they align with North Korea.
The only answer is - to remain the last standing they have. But at some point, they might not care. It is dangerous to put someone with nukes in a desperate position. Putin would not survive retreating from Ukraine - he would be in a desperate position if the odds of war are against him - currently they ain't.
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So how do you know that?
Why wouldn't russia use a tactical nuke in west Ukraine to destroy tank factories? They already are a international Pariah, that is why they align with North Korea.
The only answer is - to remain the last standing they have. But at some point, they might not care. It is dangerous to put someone with nukes in a desperate position. Putin would not survive retreating from Ukraine - he would be in a desperate position if the odds of war are against him - currently they ain't.