Yandex & Yahoo

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I was surprised to find the following entries four seconds apart in my site
log. - - [30/Sep/2008:08:32:51 +0200] "GET /sitemap.xml HTTP/1.1"
200 83320 "-" "Yandex/1.01.001 (compatible; Win16; I)" "-" - - [30/Sep/2008:08:32:55 +0200] "GET /sitemap.xml HTTP/1.0" 200
83320 "-" "Mozilla/5.0 (compatible; Yahoo! Slurp; )" "" is registered to 'Yandex enterprise network.' is

A quick search revealed no mention but is there a business relationship
between Yahoo and Yandex?

...or is Yahoo somehow spying on the sites that Yandex is indexing?

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