Funny enough, when I measured IPv6 readiness/use in the world for the very first time (2008), Ukraine was on top. IIRC it moved to third as we got more data, but it still was a very surprising result.

We found out much later that the reason was that Opera had broken RFC3484 handling and prioritized 6to4 way too high (which skewed the results), and Opera was popular in Ukraine at the time. :-)