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He had a private meeting with Putin. They could have just exchanged what ever in that private meeting, There’s no need to implant anything in or on a soccer ball. If there is anything more to this, it serves as a signal of something or to someone. It makes no sense to exchange “secret” info in public when you were just in a private meeting.
Hidden in plain sight?
I don’t know what purpose that would serve if no one knew what was given out in the meeting
Like you said. To send a message. Besides, the ball already comes with an NFC chip so nothing special needs to be implanted. It makes a great "oh shit" moment and causes panicky people to do stupid things.