It appears [1] that Russia's Ministry of Defense website is getting blocked for all IPs outside of Russia.
This seems deliberate as the request's answer is a HTTP 418 :
$ curl -v "https://eng.mil.ru/"
* Trying 82.202.189.138:443...
* Connected to eng.mil.ru (82.202.189.138) port 443 (#0)
[...]
> GET / HTTP/2
> Host: eng.mil.ru
> user-agent: curl/7.77.0
> accept: */*
>
* Connection state changed (MAX_CONCURRENT_STREAMS == 128)!
< HTTP/2 418
< date: Fri, 17 Dec 2021 16:24:13 GMT
< content-length: 0
< server: Ministry of Defence of the Russian Federation
<
* Connection #0 to host eng.mil.ru left intact
[1]
https://twitter.com/tom_bullock_/status/1471867831629266951