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That's technically not true. An implosion device utilizing uranium can make a nuke out of 20% enriched. It just would require a larger then normal number of reflectors and a larger then normal explosive amount of shaped charges to compress the uranium into a critical mass. Sure it's bloody hard to make it, but North Korea managed to make implosion devices with plutonium and they have been in contact with Iran.
Well, let's clarify some stuff.
One "enriches" uranium to concentrate the U235. The complicated enrichment process is required because there's no chemical difference between the fairly non-reactive U238 and it's more reactive lighter isotope.
A 20% enriched weapon could never be more than a "dirty nuke", intended more to create a radiological horror in Tel Aviv than to flatten the city. Especially not if it's delivered by air.
Plutonium is chemically different from uranium, and it will be separated from the nuclear waste when the operating reactors Russia is providing are refueled.
Plutonium has a much greater neutron absorption cross section than U235, which means a small critical mass is needed to make a boom. Because of the greater reactivity of Pu239, an implosion shock wave is necessary to compress the subcritical core before predetonation causes a fizzle. Given that this computer I bought over the counter has more than enough computing power to solve the hydrodynamic equations of the implosion, it's no wonder than a backwoods nation like North Korea would opt for the implosion of Pu239 instead of the massive industrial investment making U235 bombs entails.
From Wiki: Weapons-grade plutonium is defined as containing no more than 7% Pu-240; this is achieved by only exposing U-238 to neutron sources for short periods of time to minimize the Pu-240 produced. Pu-240 exposed to alpha particles will incite a nuclear fission.[citation needed]