Apex domains cannot have CNAME records.
Question and response
Question
dig kiev.sovam.com. NS
Answer
kiev.sovam.com. 5 NS ns.sovamua.com.
kiev.sovam.com. 5 NS nss.sovamua.com.
kiev.sovam.com. 5 NS nss2.sovamua.com.
Authority
The response has no authority records.
Additional
ns.sovamua.com. 5 A 212.109.32.15
nss.sovamua.com. 5 A 62.64.120.244
nss.sovamua.com. 5 A 62.208.20.18
nss2.sovamua.com. 5 A 212.82.192.242
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0