Fake Chinese part in US military hardware.

Don’t usually post here but just caught this on Yahoo mail.

http://uk.news.yahoo.com/fake-chinese-parts-found-us-planes-103012001.html

Makes you wonder how big a problem this really is and how many countries have this problem.

How big an issue is this really. Especially if the parts are doing the job well as is the case sometimes. And I dont mean in the economic or political sense I mean in the mechanical sense.