Apex domains cannot have CNAME records.
Question and response
Question
dig esputnik.com. NS
Answer
esputnik.com. 5 NS ns-185.awsdns-23.com.
esputnik.com. 5 NS ns-1742.awsdns-25.co.uk.
esputnik.com. 5 NS ns-1170.awsdns-18.org.
esputnik.com. 5 NS ns-974.awsdns-57.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0