At present the Ukrainians are too spread out in Kursk for tactical nukes to be effective. They are best used on concentrated troops.
That’s way we have nutron shells for tanks and artillery. Pinpoint radiation kills in 72-96 hours, and buildings can be reoccupied in as little as 6 weeks. The radiation passes thru everything and no much radiation life remains.
These shells would render combatants too sick within 36 hours to fight.
Its an option.
The Russians developed them, we stole it.