He could try to play that card if he wants. Since we're going full hypothetical here I suspect he'd be removed by Russian military command if he tried. If not then it's WW3 for real; there is no 'tactical' nuke scenario that doesn't lead to a wider war.
Very. Nukes are special. There aren't really any degrees of nuance with nuclear weapons. The hysteria over fallout alone will polarize the world like it has never been polarized. Ever.
