Apex domains cannot have CNAME records.
Question and response
Question
dig 191.114.217.in-addr.arpa. NS
Answer
191.114.217.in-addr.arpa. 4 NS ns3.tele-plus.ru.
191.114.217.in-addr.arpa. 4 NS ns.tele-plus.ru.
Authority
The response has no authority records.
Additional
ns.tele-plus.RU. 4 A 217.114.191.185
ns3.tele-plus.RU. 4 A 217.114.191.50
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0