Apex domains cannot have CNAME records.
Question and response
Question
dig artjomkozinsh.com. NS
Answer
artjomkozinsh.com. 5 NS ns-1608.awsdns-09.co.uk.
artjomkozinsh.com. 5 NS ns-536.awsdns-03.net.
artjomkozinsh.com. 5 NS ns-441.awsdns-55.com.
artjomkozinsh.com. 5 NS ns-1186.awsdns-20.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0