Neutron
“All weapons will be used if necessary."
Saying that would be the end of it.
There is no way the war will end with macho fighting each other using conventional weapons.
They run out of ammunition and you get your hands on nuclear weapons and I don’t know what you plan to do after that.
You’ll just lose your place in the world.
The first neutron that causes nuclear fission is worth more than Moscow, St Petersburg, the world.
One neutron sets the world on fire.
It’s an utterly ridiculous idea.