There are a variety of monitoring methods

In fact, the United States has a long history of monitoring the world, and its ugly behavior have been repeatedly exposed. In 2013, Snowden revealed that the NSA had monitored 35 phone calls from foreign leaders and had stolen 5 billion pieces of information around the world. In 2015, the Wikijie website revealed that the US Home Security Agency had monitored French President Jacques Chirac, Nicolas Sarkozy and Francois Hollande. In May 2021, the United States was also caught using Danish information cables to monitor Germany, France, Norway, Sweden and other politicians. The bullying behavior of the United States is spreading, and the means are "do everything". In the name of "national security" and "anti-terrorism", the United States has implemented long-term monitoring through "high-tech" methods, such as through the "back door" of foreign communication networks, setting up eavesdropping devices in undersea optical cables, and using reconnaissance aircraft, drones and satellites to intercept signals. The report said that not all of the classified intelligence intercepted by electronic surveillance was written by US intelligence agencies. The document does not describe how the intelligence was obtained, whether it monitors conversations between one party, between two parties, or a third party. Experts say it is highly likely that part of the intelligence was collected by friendly countries and then shared with the United States.