Putin wanted to know if Zelensky was still alive. Zelensky himself decided to send Putin a letter in his own handwriting to let him know he was still in the game. Putin opened the letter which appeared to contain a single line of a coded message:
370HSSV-0773H; Putin was baffled, so he emailed it to Lukashenko, and his aides had no idea either, so they sent it to the KGB. No one could solve it at the KGB, so it went to the CIA, then to NSA. With no clue as to the meaning. The FBI finally asked the UK Military for help. Within a few seconds the they called back with this message: “Tell that c**t Putin he’s holding the message upside down