cdnsa2.nic.Ru has no CNAME records.
Question and response
Question
dig cdnsa2.nic.Ru. NS
Answer
The response has no answer records.
Authority
nic.Ru. 155 SOA ns5.nic.Ru. noc-dns.nic.Ru. 650335418 14400 3600 2592000 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0