Apex domains cannot have CNAME records.
Question and response
Question
dig TTCOM.RU. NS
Answer
TTCOM.RU. 5 NS ns2.TTCOM.RU.
TTCOM.RU. 5 NS ns1.TTCOM.RU.
Authority
The response has no authority records.
Additional
ns1.TTCOM.RU. 5 A 95.140.16.1
ns2.TTCOM.RU. 5 A 95.140.17.1
ns1.TTCOM.RU. 5 AAAA 2a00:6520:0:1:0:0:0:1
ns2.TTCOM.RU. 5 AAAA 2a00:6520:0:2:0:0:0:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0