Apex domains cannot have CNAME records.
Question and response
Question
dig NETANGELS.RU. NS
Answer
NETANGELS.RU. 5 NS ns4.NETANGELS.RU.
NETANGELS.RU. 5 NS ns3.NETANGELS.RU.
NETANGELS.RU. 5 NS ns1.NETANGELS.RU.
NETANGELS.RU. 5 NS ns2.NETANGELS.RU.
Authority
The response has no authority records.
Additional
ns1.netangels.ru. 5 A 91.201.54.2
ns2.netangels.ru. 5 A 91.201.52.2
ns3.netangels.ru. 5 A 45.86.39.2
ns4.netangels.ru. 5 A 80.87.101.2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0