Will Putin use a nuclear weapon against Ukraine?

{@davidt8899] this only a theory there are two good reasons why putin would not go down that road. yesterday there was a warning came from joe biden for putin not to consider to use any weapon of mass destruction against ukraine either chemical biological or nuclear.far as joe goes this could be a game changer if putin stepped over that line and making russia a further pariah around the world .putin is crazy and this is not much doubt there but i think he realizes any direct conflict with the us would cause world destruction on a grand scale .another thing as far as mad vlad goes russia is winning this war despite losing ground in parts of ukraine and seeing his troops retreating