Apex domains cannot have CNAME records.
Question and response
Question
dig ESOO.RU. NS
Answer
ESOO.RU. 5 NS ns3.ESOO.RU.
ESOO.RU. 5 NS ns1.ESOO.RU.
Authority
The response has no authority records.
Additional
ns1.esoo.RU. 5 A 213.135.97.131
ns3.esoo.RU. 5 A 213.135.96.250
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0