But that is exactly what they have been doing - for example by trying to destroy the power grid over winter. They failed. The only weapon they have that they h

But that is exactly what they have been doing - for example by trying to destroy the power grid over winter. They failed. The only weapon they have that they haven't used is nuclear. It has been made clear to them that the consequences of nuclear weapon release would be 'catastrophic'. Thus the slugfest, as we supply Ukraine with what it needs to continue destroying Russia's conventional forces in the field.