I imagine the free Ukraine getting access to 24 tactical neutron 155mm shells could reduce the Russian offensive buildup while massed in the initial stages of their war of aggression. That the Russian government has threatened Ukraine and the West, lobbing few dozen environmentally friendly clean nukes is self defense by the smaller less conventional sized defensive forces available to the Ukraine. Two can play that game.
For now, it’s all just sabre-rattling. When Russia cuts off the gas to Europe, then we know it’s serious.