That is not how diplomacy, especially top-level diplomacy works.
This slip was the tip of the iceberg when it comes to That Is Said Behind Closed Doors Precisely Because The Leaders of Countries Expect Privacy.
I imagine some of what would be said would be shockingly candid and impolitic, like this exchange.
Not sure I could fault either leader for saying what was on their mind, although if you have a microphone on you, you should be careful. I do see that much in what you are saying.

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