Apex domains cannot have CNAME records.
Question and response
Question
dig ufanet.RU. NS
Answer
ufanet.ru. 5 NS ns1.ufanet.ru.
ufanet.ru. 5 NS ns2.ufanet.ru.
Authority
The response has no authority records.
Additional
ns1.ufanet.ru. 5 A 81.30.199.50
ns2.UFANET.RU. 5 A 81.30.199.67
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0