Apex domains cannot have CNAME records.
Question and response
Question
dig pe.ua. NS
Answer
pe.ua. 4 NS nsc1.srv53.org.
pe.ua. 4 NS nsd3.srv53.com.
pe.ua. 4 NS nsc3.srv53.com.
pe.ua. 4 NS nsa1.srv53.net.
pe.ua. 4 NS nsa3.srv53.com.
pe.ua. 4 NS nsc2.srv53.net.
pe.ua. 4 NS nsb1.srv53.com.
pe.ua. 4 NS nsa3.srv53.org.
pe.ua. 4 NS nsb3.srv53.org.
pe.ua. 4 NS nsd2.srv53.org.
pe.ua. 4 NS nsb4.srv53.net.
pe.ua. 4 NS nsd4.srv53.net.
Authority
The response has no authority records.
Additional
nsa1.srv53.net. 4 A 5.39.10.94
nsb1.srv53.com. 4 A 135.181.9.147
nsc1.srv53.org. 4 A 78.27.225.71
nsa1.srv53.net. 4 AAAA 2001:41d0:203:dee4:5:39:10:94
nsb1.srv53.com. 4 AAAA 2a01:4f9:4a:530c:181:9:147:2
nsc1.srv53.org. 4 AAAA 2a02:2279:0:1201:78:27:225:71
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0