This is true. Russia saber rattling about using nuclear weapons, doesn’t mean much. Putin knows this would not lead to victory and likely would end up with him losing power and likely life.
The scary time is what he will do when he will see his power slipping. Thankfully in 1992 Gorbachev managed to handle it peacefully. Hopefully when it happens it will end up similarly.
Also to add that Raisin was groomed to take his place, and apparently the guy Raisi was grooming to take his was also in the helicopter.
Khamenei is 85 years old.