OREANDA-NEWS Russia's Federal Security Service (FSB) said on Monday that it had prevented a series of terrorist acts against the authorities of the Kherson Region and Crimea, and obtained data on an operation conducted by foreign security services.It also said that the FSB obtained the data on an operation conducted by foreign security services, apprehended the perpetrators and their accomplices, seized the means of committing crimes, and detected their communication channels and ways of financing.