That would be an awkward claim considering Ukraine _had_ nuclear weapons and gave them up to Russia in the 90s for guarantees about Ukraine's territorial integrity. Obviously that didn't work so well for Ukraine now
> Ukraine have acceded to the Nuclear Non-Proliferation Treaty (NPT) as non-nuclear states and are now transferring Soviet missiles and warheads to Russia for dismantlement on a strict schedule.
> Ukraine gave up a huge arsenal of nuclear weapons left over by the Soviet Union in the early 1990s, and used the fuel from its blended-down warheads to drive its nuclear power plants.
