Apex domains cannot have CNAME records.
Question and response
Question
dig gmhost.pp.ua. NS
Answer
gmhost.pp.ua. 5 NS ns3.gmhost.com.ua.
gmhost.pp.ua. 5 NS ns2.gmhost.com.ua.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0