Hello. We would like to import milk products to The Netherlands from Kazakhstan. Would you mind telling me the rules and regulations on this? What documents and steps are needed? 

First link on Google (importing dairy into the Netherlands):

 

https://www.government.nl/topics/travelling-outside-the-netherlands/customs-declarations/transport-of-animal-products-to-the-netherlands

Joost gave you a link specific to transportation

Steps and regulations is not possible to give you on a public forum.

 

I can give you links to information sites on doing business in the Netherlands

 

Government information for entrepreneurs - General information

https://business.gov.nl/
 

Netherlands Enterprise Agency - is a governmental agengy but more "handson" advice and sector networks.
https://english.rvo.nl/

 

These sites are in Dutch but I'm sure Google Chrome or other browsers can help with translation

 

Importing foodproducts - it is an article with a lot of relevant subjects to your question. And has multiple links to other sites. (KvK is short for Kamer van Koophandel or Chamber of Commerce)

https://www.kvk.nl/advies-en-informatie/internationaal-ondernemen/importeren/levensmiddelen-importeren/

 

Dutch Dairy Association - Sector specific organisation on milkproducts, more focused on export than import.

https://www.nzo.nl/en/

 

This information should help I think.