Apex domains cannot have CNAME records.
Question and response
Question
dig nwgtm.ru. NS
Answer
nwgtm.ru. 5 NS jillian.ns.cloudflare.com.
nwgtm.ru. 5 NS yadiel.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0