How to explain the overlapping circles? The solid versus empty bubbles? Those with numbers inside, and to the left or to the right? Those bubbles showing a precise number and those that show a range? Pakistan ranking below India?
The chart fails our self-sufficiency test: the chart does not lose any power if we remove all the bubbles because every piece of data has been printed on it.
A two-sided dot chart may be appropriate here, shown next. The relative scale of Russia and U.S. warheads to those of other nuclear powers is starkly revealed.