Wankery squared.
The problem is that these things are weapons of war and they are designed to kill people. This exercise is childish and pointless because, if the recipient is close enough to read the signature, they are probably going to be killed by the shell. And they won't be the people responsible for the mess. Putin will be hundreds of miles away, in a bunker if there is any sign of incoming munitions.
Most of the people who are killed by these things are conscripts who have been herded together and then force to run at the Ukrainian positions with little chance of survival. They had families and friends and they would rather be there with them than being killed by shells with amusing artwork.
Wankery indeed.