Apex domains cannot have CNAME records.
Question and response
Question
dig 1GL.RU. NS
Answer
1GL.RU. 5 NS ns1.fr.RU.
1GL.RU. 5 NS ns2.fr.RU.
Authority
The response has no authority records.
Additional
ns1.fr.RU. 5 A 85.119.149.30
ns2.fr.RU. 5 A 91.214.116.107
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0