If this was classified, and only Russian officials have been given this leaked info, why would they let the press (NYT in this case) publish this? i.e if Russia

If this was classified, and only Russian officials have been given this leaked info, why would they let the press (NYT in this case) publish this? i.e if Russian officials were the only one this was originally leaked too, then ISIS would still have no idea that Israel had hacked their systems.