Apex domains cannot have CNAME records.
Question and response
Question
dig printnet.kiev.ua. NS
Answer
printnet.kiev.ua. 5 NS nsc4.srv53.org.
printnet.kiev.ua. 5 NS nsa4.srv53.org.
printnet.kiev.ua. 5 NS nsb2.srv53.org.
printnet.kiev.ua. 5 NS nsd3.srv53.com.
printnet.kiev.ua. 5 NS nsa2.srv53.com.
printnet.kiev.ua. 5 NS nsb1.srv53.net.
printnet.kiev.ua. 5 NS nsa2.srv53.net.
printnet.kiev.ua. 5 NS nsd2.srv53.net.
printnet.kiev.ua. 5 NS nsc2.srv53.net.
printnet.kiev.ua. 5 NS nsb4.srv53.com.
printnet.kiev.ua. 5 NS nsd2.srv53.org.
printnet.kiev.ua. 5 NS nsc4.srv53.com.
Authority
The response has no authority records.
Additional
nsb1.srv53.net. 5 A 135.181.9.148
nsb1.srv53.net. 5 AAAA 2a01:4f9:4a:530c:181:9:148:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0