What I don't like seeing is a country outside our strategic alliances owning both allied top of the line aircraft like the Hornet and potential enemy aircraft as well. This gives them the perfect way to develop counter measures against our aircraft. And it is 'our' aircraft that they are potentially countering.
With a bit of luck, their latest Soviet block purchases will all fall out of the sky because of lack of spare parts, service and faulty construction.
As I said on another thread, I dislike the US, selling the latest fighter aircraft outside our alliances for mere money and one day we will pay for it.