Article 4 of China's patent law stipulates that an application involving national security should be treated as a confidential patent application, that is, the invention content is not open but protected. If you are interested, you can see on the website of the Intellectual Property Office that some patent agencies indicate their "national defense" and require that applications involving national security such as weapons be kept confidential. 2. Other parties shall obtain permission to use patents (including confidential patents).
However, since the confidential patent has not been made public, its contents cannot be known, so it is actually not infringement for others to use it, because you can't ask others to do things he doesn't know. Of course, there are also some weapons inventions, which are not confidential patents and must be approved by others. (Note that obtaining the license only means that you have not infringed the patent, but your future use behavior should also comply with the laws of the country). As for the murder, the perpetrators themselves bear it. All countries will take some measures to protect national security technology, of course, not only to protect patents.