Apex domains cannot have CNAME records.
Question and response
Question
dig EGS63.RU. NS
Answer
egs63.ru. 5 NS ns.egs63.ru.
egs63.ru. 5 NS ns1.egs63.ru.
egs63.ru. 5 NS ns3.egs63.ru.
Authority
The response has no authority records.
Additional
ns.egs63.ru. 5 A 31.171.194.2
ns1.egs63.RU. 5 A 31.171.194.10
ns3.egs63.ru. 5 A 31.171.194.17
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0