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> They're pretty obviously doing this, Ukranian forces seem to have a lot of knowledge about Russian movements.

There are direct reports of this. IIRC, they're taking raw intelligence, scrubbing it to hide sources and methods (they think the Ukrainian government is full of Russian spies), and refraining from recommending specific actions based on it (because they feel like that would cross some stupid line and irritate the Russians too much). My understanding is that they've been able to get timely updates the the Ukrainians pretty quickly.