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Re:Belarus 'diverts Ryanair flight to arrest journalist', op... by T-A on Sunday May 23, 2021 @03:53PM (#27257987)
As far as I know 7700 is a generic emergency code:

https://www.flightradar24.com/blog/squawking-7700-in-flight-...

Re:Belarus 'diverts Ryanair flight to arrest journalist', op... by upofadown on Sunday May 23, 2021 @08:59PM (#27260125)
I think the point being made here is that 7500 would be used for unlawful interference like a hijacking or bomb threat. 7700 would be more appropriate for an interception.