I had a non-IT boss that used to power off and on an entire rack when one of their VMs acted funny, without notifying anyone. Some of the servers were production. I'm not sure a sign would help and dogs do not like the cold.
Over the years borders are dynamic. Most of the time they are changed via wars, violent conflicts and later treaties, some more stable than others. It happen all over the world throughout history. Unless there is a large physical border, you can look at almost any part of the world and see the huge amount of border changes over the years. Focusing on just two places like the above "meme" is hypocrisy.
Azumanga Daioh