IIRC, he also helped the French complete and test their own neutron bomb.
Most nations that tinker with that particular weapon design tend to be very vague as to its existence or quantity. It is truly idiotic to have that arrow in your quiver, then willingly throw it away like Bush 41 did. Very foolish.
****or if they worked most of it out on their own****
Years ago it was said the Israelis and South Africans built them together.