ns4-cloud.nic.RU has no CNAME records.
Question and response
Question
dig ns4-cloud.nic.RU. NS
Answer
The response has no answer records.
Authority
nic.RU. 83 SOA ns5.nic.RU. noc-dns.nic.RU. 650335419 14400 3600 2592000 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0