Apex domains cannot have CNAME records.
Question and response
Question
dig beelinegprs.ru. NS
Answer
beelinegprs.ru. 4 NS ns3.gldn.net.
beelinegprs.ru. 4 NS ns2.gldn.net.
beelinegprs.ru. 4 NS ns2.beeline.ru.
beelinegprs.ru. 4 NS ns1.beeline.ru.
beelinegprs.ru. 4 NS ns1.beelinegprs.ru.
beelinegprs.ru. 4 NS ns2.beelinegprs.ru.
Authority
The response has no authority records.
Additional
ns1.BEELINE.RU. 4 A 217.118.84.9
ns1.beelinegprs.RU. 4 A 217.118.66.243
ns2.gldn.net. 4 A 194.67.2.109
ns2.beeline.ru. 4 A 217.118.84.65
ns2.beelinegprs.RU. 4 A 217.118.66.244
ns3.gldn.net. 4 A 194.67.7.1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0