Nagasaki was hit with a Plutonium bomb.
About 99% of all nuclear weapons today are Plutonium. Only N. Korea and **maybe** Pakistan have their nukes from U-235.
Plutonium does not require months or years of centrifuge activity. It is likely N. Korea will transition their weapons to Plutonium soon, since they have a power reactor. As does Iran. Spent fuel rods are the plutonium source.
(It largely doesn’t matter if the centrifuges were destroyed)
For some reason, I understood Israel’s nukes were U235 implosion devices. (I always thought only plutonium worked like this, but U235 apparently does, too.)
The advantage of U235 warheads is they don’t need reprocessing nearly as often as plutonium.