Lots of failures are just human and political. Sure technology can obscure the obvious or highlight the unlikely, but it's just not that commonly influential (at least not yet, the day will come).
The US even warned Russia of the attack in Moscow, but it was treated as political interference. That was almost certainly signals intelligence ignored.
The US even warned Russia of the attack in Moscow, but it was treated as political interference. That was almost certainly signals intelligence ignored.
https://apnews.com/article/russia-intelligence-duty-to-warn-...