There was a really interesting* piece in issue 4 of The Blizzard** about that...
Basically, the Kazakh FA thought that it would improve football in Kazakhstan to be part of UEFA and thus playing teams like Spain, Italy, Germany, Netherlands, etc. rather than in the Asian confederation playing the likes of (with no disrespect) Japan, S Korea, Iran, etc. There were also some sort of economic reasons - being part of UEFA rather than the AFC could possibly lead to closer economic ties with the US and EU. Anyway, whereas before they were continuously improving and getting close to qualifying for major tournaments - generally easily getting through to the final qualification stages for the World Cup - now they're stagnating at best and not getting anywhere near qualifying, and usually only beat teams like Armenia.
*Well...if you're interested in that sort of thing
**See the link in my sig if you don't know what that is






