Apex domains cannot have CNAME records.
Question and response
Question
dig NEICON.ru. NS
Answer
NEICON.ru. 5 NS ns3.dns2b.ru.
NEICON.ru. 5 NS ns5.dns2b.ru.
NEICON.ru. 5 NS ns1.dns2b.ru.
NEICON.ru. 5 NS ns2.dns2b.ru.
NEICON.ru. 5 NS ns4.dns2b.ru.
Authority
The response has no authority records.
Additional
ns1.dns2b.RU. 5 A 176.99.135.106
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0