Dude, we can get the Russian or Chinese stuff, there is no need for a loophole. The problems is that the Russian or Chinese systems are not compatible with the missile shield we're a part of. It seems clear that we won't go for the Russian or Chinese systems but let them still enter the tender in order to get the best possible deal (in terms of price and technology transfer) for us from the Europeans or Americans. MBDA is apparently offering a full-technology transfer which would be awesome.
Some people over estimate what the NATO has to say and what not
BronzePlaque, there is no restriction, no hyprocrisy (at least) in this case.