Russia uses Nukes on Ukraine , then what happens?

This could happen , it looks like a stalemate on the battlefield and nukes would insure Putin that no missiles will be brought into Ukraine with radiation.

Russia uses Nukes on Ukraine , then what happens?
US uses Nukes on Russia
Biden blames Trump
Europe uses nukes on Russia
Nothing happens to Russia , because US leaders and European leaders are sissy boys
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Russia uses Nukes on Ukraine , then what happens?
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