Apex domains cannot have CNAME records.
Question and response
Question
dig PRIMORYE.ru. NS
Answer
PRIMORYE.ru. 4 NS ns2.pk.ru.
PRIMORYE.ru. 4 NS ns1.pk.ru.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0