ru zone: The server(s) were not responsive to queries over UDP. See RFC 1035, Sec. 4.2. (2001:678:16:0:194:85:252:62)
ru/DNSKEY: No response was received from the server over UDP (tried 4 times). See RFC 1035, Sec. 4.2. (193.232.142.17, 2001:678:15:0:193:232:142:17, UDP_-_EDNS0_512_D_KN)
ru/NS: No response was received from the server over UDP (tried 12 times). See RFC 1035, Sec. 4.2. (2001:678:16:0:194:85:252:62, UDP_-_NOEDNS_)
ru/DNSKEY has errors; select the "Denial of existence" DNSSEC option to see them.
Warnings (1)
ru/SOA: No response was received from the server over UDP (tried 6 times) until the COOKIE EDNS option was removed (however, this server appeared to respond legitimately to other queries with the COOKIE EDNS option present). See RFC 6891, Sec. 6.1.2. (193.232.142.17, 2001:678:15:0:193:232:142:17, UDP_-_EDNS0_4096_D_KN)