It is very difficult to replace innovative operatives such as the one who was reportedly killed.
Apr 22, 2014 | 13:29 GMT
Despite recent incidents, the two groups are currently too dependent on each other to let a serious rift occur.
Apr 22, 2014 | 04:20 GMT
Programs such as PRISM begin modestly but turn dangerous when left unchecked.
Apr 22, 2014 | 03:01 GMT