Putin has threatened to use nuclear weapons several times in his war, but has backed down every time, assuming he ever had the intent to use nuclear .weapons.

it is doubtful those under him would execute an order to use them. They know firing a nuclear weapon would mean their death and the deaths of their families. They would be responsible for the deaths of their families.

During the Cold War there were a couple of times Soviets were told they were being attacked but refused to launch nuclear warheads. In each instance their intel was wrong. Cooler heads prevailed.

The Russia military has no desire to lose their lives and the lives of their families to satisfy the ego of an egomaniac.