A week ago Putin himself decided to send Biden a letter in his own handwriting to let him know he was still in the game. Biden opened the letter which appeared to contain a single line of a coded message. (Biden is restricted to single sentences.)
370HSSV-0773H
Biden was baffled, so he emailed it to John Kerry, and his aides had no idea either, so they sent it to the FBI. No one could solve it at the FBI, so it went to the CIA, then to NSA. With no clue as to the meaning. The FBI finally asked the Australian Military for help. Within a few seconds the they called back with this message:
“Tell Biden he’s holding the message upside down."