Apex domains cannot have CNAME records.
Question and response
Question
dig NURTELECOM.kg. NS
Answer
nurtelecom.kg. 5 NS ns01.nurtelecom.kg.
nurtelecom.kg. 5 NS ns02.nurtelecom.kg.
nurtelecom.kg. 5 NS ns03.nurtelecom.kg.
Authority
The response has no authority records.
Additional
ns01.nurtelecom.kg. 5 A 194.152.36.41
NS02.nurtelecom.kg. 5 A 194.152.36.42
ns03.nurtelecom.kg. 5 A 195.216.237.254
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0