Apex domains cannot have CNAME records.
Question and response
Question
dig gtnet.RU. NS
Answer
gtnet.RU. 5 NS inn361.RU.
gtnet.RU. 5 NS golitsyno.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0