Logic you should stand by your ID. Logic says US and NATO are not reliable.. they have proven themselves they are not reliable, they have also proven they are many ways against Pakistan's State Interests and would like to make you weak so that you wouldn't resist when they deploy their plans.
China is your most trusted friend.. they might not be the best in the world "yet" but they are the most reliable partners you could ever have. We cannot feel proud of a gun which is world's best but at time when we would need that, the maker of the gun wouldn't supply us the bullets we need to defend ourselves.
Look why is Pakistan pushing China to supply JF-17 although we have good number of F-16s to fight Americans if they invade. Reason is simple, Americans know what codes disable their own provided missiles and what switches would shut-down engines of our pride aircraft.
Also China is THE emerging power of the world. Its only matter of time when Chinese equipment will be on par with western and American equipment so why not invest with them when sun is rising for them. And just to tell you a little... Chinese in many ways are better than Russians by the time we talk. They are even approaching American standards with more rapid rate than you and I imagine. Have faith. You don't find dependable people every day and when you have them, be thankful to God for He gave you opportunity to have them in life.