“...Doesn’t appear they got any of our agents, just some of our recruited foreign national assests. ...”
They’re still OUR people, and some traitorous POS gave them up or compromised them, one way or another.
They are not OUR people... They are sources of temporarily useful information, each associated with a risk and cost of maintainence. They are likely not loyal to us or our interests, and would just as easily compromise our actual agents for a buck... Criminals, terrorist associates, insurgents, greedy traitors... just like the spies in our own ranks. They could additionally easily be double agents, foreign CI plants, providing false information, too risky to keep, outlived their usefulness, etc. ... there are many legitimate reasons to give up sources, what is unusual is that we publically admit it, but I bet there is a good reason.