Precise information about NATO operatives in Ukraine are relayed and verified by the Undercover Operators, even before they could settle down in war manoeuvres.
I think like minded Russian Sympathizers hate NATO boots on their soil as compared to Russians.
In spite of their well coordinated ammunition gathering and storing with Polish support, detailed movement of these big military equipment could be surveyed by aerial reconnesaince.
These equipment were stored in Poland years ahead and Polish are caught with their pants down.