The official story that the Kazakhstani tell seems to be:
Kazakhstan followed this move with an even more historic initiative when we voluntarily renounced the world’s fourth largest nuclear arsenal, which we inherited on the break-up of the Soviet Union. No country has done more to bring the goals of the NPT closer.
US official history as retold by the Council of Foreign relations seems to be:
The former Soviet republics of Ukraine, Belarus, and Kazakhstan—where the Soviets based many of their nuclear warheads—safely returned their Soviet nuclear weapons to post-communist Russia in the 1990s, but all three countries still have stockpiles of weapons-grade uranium and plutonium.
How do you know?
The official story that the Kazakhstani tell seems to be:
US official history as retold by the Council of Foreign relations seems to be: