You do not need to provide any documents to register public domains (.com / .net / .org, .com.ua, kiev.ua, region.ua). It is enough to find a free domain name that you are interested in, fill an application form and pay for domain name registration services according to the IMENA.ua service rates.
Providing documents is mandatory in case of changing the domain owner (administrative contact), as well as domain transfer to another registrar. We have to be sure that the request comes from the person who is the current owner of the domain. This measure protects the owner from the interception of his domain by other people.