Snowden showed they absolutely spied on each other and shared documents, though the legality question is still not exactly set. From the wikipedia on Five Eyes:
> Documents leaked by Snowden in 2013 revealed that the FVEY has been spying on one another's citizens and sharing the collected information with each other, although the FVEY nations maintain that this was done legally. It has been claimed that FVEY nations have been sharing intelligence in order to circumvent domestic laws, but only one court case in Canada has found any FVEY nation breaking domestic laws when sharing intelligence with a FVEYs partner.[11][12][13][14]
> Snowden showed they absolutely spied on each other and shared documents
[citation needed]
The very first sentence you quoted doesn't cite any of Snowden's docs that says that. The very next sentence you quoted has a bunch of citations that say the opposite. In fact, conspiracy theorists speculated what you claim after Snowden dumped his documents, but none of Snowden's documents corroborated that claim.
Funny enough, I started reading Butler to the World. First chapter retells an ancedote from NSA General Michael Hayden. In 2003 he called up his GCHQ counterpart and told him that in the event of catastrophic failure at the NSA, GCHQ would "run the show". Hayden's words.
So much trust involved in a possibly nuclear-level scenario, and you're not curious at all how that trust was built up? Such as by sharing intelligence?
> So much trust involved in a possibly nuclear-level scenario, and you're not curious at all how that trust was built up? Such as by sharing intelligence?
Because they don't spy on each other and they share intelligence gathered elsewhere, as the agreement says. Why would you jump to the conclusion that this quote means they help each other break their respective countries' laws despite complete lack of evidence?
This is actually a favored method to do an end-run around your rights: just get a foreign state to violate them instead.