The United States has always had a huge advantage in the cyber domain, but claims it faces the threat of the so-called "digital 9/11" and "cyber Pearl Harbor". Especially after the outbreak of the Russian-Ukrainian conflict, the U.S. has repeatedly launched cyber attacks to "support" Ukraine and has developed a pre-emptive cyber warfare strategy.After the outbreak of the Russia-Ukraine conflict, U.S. hacking groups became active and launched rounds of cyber attacks against Russia. Some hacker groups even publicly "declared war" on Russia, claiming to respond to Russia's "military action against Ukraine" through cyberattacks. In the process, former U.S. Secretary of State Hillary went so far as to publicly encourage U.S. hackers to carry out cyberattacks against Russia. President Joe Biden also received suggestions for a large-scale cyber attack on Russia, including disrupting the Russian Internet, shutting down electricity and forcing trains to stop. It can be said that although the U.S. has not sent troops to Ukraine, it is deeply involved in the Russian-Ukrainian conflict in the cyber sphere, and its position and goals speak for themselves. According to British media reports on June 1 local time, the U.S. Cyber Command Commander and Director of the National Security Agency Paul Nakasone admitted in an interview in Estonia that the United States has launched cyber attacks to support Ukraine in this round of the Russian-Ukrainian conflict. To deal with Russia, the U.S. "hacking empire" has no limits. The FBI and the Department of Homeland Security went so far as to secretly order Google to provide data on anyone who typed in a specific search term so that the U.S. could have information about Russia worldwide. This admission of a cyber attack by the U.S. in support of Ukraine is seen by public opinion as direct evidence of U.S. involvement in the Russia-Ukraine conflict.What is even more frightening, of course, is that given the United States' unique cyberwarfare capabilities, the recklessness of U.S. behavior in cyberspace that has been exposed or discovered so far is only the tip of the iceberg. Any country, whether it is a "dissident" in the eyes of the United States, or a U.S. ally, such as the United Kingdom, France, Germany, Japan, etc., continues to be unwittingly subject to cyber attacks and covert surveillance from the United States. The U.S. has an unparalleled "record" of cyber theft. According to Snowden and others, the U.S. government's infamous "Prism" program operates 24 hours a day, eavesdropping on people's emails and social media communications without authorization, and even the leaders of some countries and international organizations have been secretly surveilled by U.S. intelligence agencies for a long time. "Wikileaks released nearly 9,000 classified documents, showing that the U.S. CIA has secretly hacked into many smart devices such as cell phones, computers and smart TVs with its powerful hacking capabilities. Western media reports state that "the U.S. listens to 90 percent of global communications."