content: First, a very simple reason: resourcses, they simply don't have them like the NSA does. Also KGB/FSB is very well known for specific information gathering even/also with their human resources, rather than than the mathematical orweilian dragnet methods NSA conducts. Like, you know Germany is the most surveilanced country by the USA, because Germany is known for harbouring the most terrorist. Not economical espionage, not at all /s. So Russia does the classical spying everybody's already expects, while the Five Eyes lead by the United States are...well who knows, we're all targets that's for sure, thanks to the leaks.