@lacuda nah, looks like they put up a geo filter. Remains accessible from inside Russia.

Interesting choice of response code though.

409 Conflict would have also been appropriate.

@MountainMan the wiki link tells about the proposed (joke) Hyper Text Coffee Pot Control Protocol:
https://en.m.wikipedia.org/wiki/Hyper_Text_Coffee_Pot_Control_Protocol

The protocol suggests an HTTP 418 error code to indicate the device is a tea pot rather than a coffee pot.

For whatever reason, the Russian military website is returning that 418 code rather than a more usual 403 Forbidden.

@john_b

Thanks John, I think I got it.