[curiousllama]

Note that there are different levels of "secret" when it comes to this stuff. Given the size of that meeting (20+ people) and the reaction, I'd be surprised if the topic matter was more secret than how much the defense agencies pay their employees - secret, no doubt, but not exactly the nuclear launch codes.

[estaseuropano]

Indeed this was a ministerial level conference, the prep meetings are probably more secure and no one would be stupid enough there to share screenshots.

At least since Snowden EU leaders probably always assume that someone is listening in. NSA and GHQ had breached Belgacom (Belgian former telecoms monopoly) to listen in on the EU.