This is nothing new. Fabrique Nationale manufactures the M16 rifles our troops are equipped with. The Apache helicopter program has contracts with almost every NATO country to manufacture avionics and airframe parts. Electronics every have Made in Taiwan stamped on them.
What about when the Euros sell our designs from their US acquisitions to China or refuse to supply parts because we didn't get UN approval for defending ourselves?
Definately nothing new. BAE Systems is a sub contractor on several large defence projects where Lockheed or NGC are the prime contractor.
They are ramping up and becomming a more major player in the US defense industry, but they were a player long before this.
The company I work for is a US corporation, but we have busines units in England and in Canada. Our company sells a lot of products to the defense industry.
There are times that we are required us to use our domestic support staff to address issues with products that have been developed outside the US because of security concerns.
I also wouldn't expect the government to contract with our non-domestic business units to build subsystems going into sensitive defense hardware.