how does spying and secret agencies work? how do they figure out what other countries are planning?
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Mainly: Espionage (Following someone in all means possible without him noticing), SIGINT (interception of signals in communication to get more info about someone or something) and OSINT (the collection and analysis of data gathered from open source, there are a lot of ways).
They follow other countries signals/communications via SIGINT or Espionage with Spies that stay in contact with the Spying country, and they can also do it via OSINT.
Also, FBI/USA/Other agencies related to some countries have access to phone information and any other technology device you have thus making it hard to hide a secret.
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