rex.kiev.sovam.com has no NS records.
NS records for this zone are defined at kiev.sovam.com.
NS records for this zone are defined at kiev.sovam.com.
Question and response
Question
dig www.kiev.sovam.com. NS
Answer
The response has no answer records.
Authority
kiev.sovam.com. 3600 SOA ns.sovamua.com. domaintech.kiev.sovam.com. 2020010600 14400 3600 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0