I'm here for the small chortles today.
https://twitter.com/vxunderground/status/1496878462690340865
https://en.wikipedia.org/wiki/Hyper_Text_Coffee_Pot_Control_Protocol
@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.