If you could temporarily redirect BGP at an arbitrary time, at diplomatic risk, what would be the best use of that?

Surely OpenNet/ClassNet/NIPRNet/SIPRNet/GWAN/JWICS aren't accepting BGP updates, where they even touch public network infrastructure.

And I can't think of anything outside those huge spheres that would be worth burning a capability like that on a lark.

Maybe bulk sensitive data transfer? I.e. some site-to-site backup?

Or you're just looking at the metadata of where-to-where, with the goal of finding future targets.