So meaningless that its diplomacy has been used for decades, last but not least to put the US in contact with Cuba for one of the most important diplomatic exchanges in modern history.
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Lol. Without wishing to get too OT I think you're vastly overstating the Pope's significance there and especially it being "one of the most important diplomatic exchanges in modern history". That comment is laughable.
Just because the US finally got over its spat with Cuba that the rest of the world got over and stopped caring about decades ago hardly qualifies as important on the world stage currently, let alone "most important diplomatic exchanges in modern history". You can thank the confluence of the switch to Raul Castro and Obama who is more diplomatic than recent US presidents for this. Fidel probably couldn't forgive the US for trying to kill him so many times, and I probably wouldn't either.
The Pope is powerful among those unfortunate enough to be afflicted by a particular strain of
The God Delusion, nothing more and nothing less. In the world of geopolitics, Vatican City and its religion have never been less influential "in modern history".
I doubt there are many other world leaders willing to meet Tim Cook unless signicant investment is involved.