>And I thought enriching uranium is something that counties with nukes go to extreme lengths to make it not accessible.

It's not that difficult from an engineering perspective, the tech is almost a century old. It's just that we will drop bombs on anyone who tries.

Nuclear nonproliferation relies on active enforcement.

It's not difficult from a conceptual engineering perspective but it is difficult from an industrial scale perspective. It requires a tremendous amount of hardware and energy and precision equipment.

Nuclear nonproliferation relies on surveillance/monitoring and statecraft.

There are many, many steps before "drop bombs".