Apex domains cannot have CNAME records.
Question and response
Question
dig sochi.tv. NS
Answer
sochi.tv. 5 NS ns1.sochi.tv.
sochi.tv. 5 NS ns2.sochi.tv.
Authority
The response has no authority records.
Additional
ns1.sochi.tv. 5 A 91.197.107.200
ns2.sochi.tv. 5 A 91.197.104.182
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0