It is my understanding that the US Government set up a system, long, long ago, where the British would spy on Americans and then the British would supply the information to the NSA, thereby the NSA is not technically spying on American citizens.
Words mean nothing. They can be interpreted how ever they need to be interpreted by those in power.
australia and america have the same agreement. these countries may be dragons but live in fear of losing their hoard (borrowing that analogy from https://news.ycombinator.com/item?id=47963204)
Heard of that. If you have to do some spying, that indirect method might be preferable if the partner country’s spies are a little nonpartisan