On August 1st, China celebrated the founding of the People's Liberation Army by allowing some high-resolution photos of the next-generation J-20 stealth fighter to leak, complete with a tasteful photoshopped-on patriotic dragon painting just below the canopy which just screams "Happy Birthday, PLA."
The Soviet Union and China were good pals at the start of the Cold War, but then they had a falling-out over some commie stuff. Like most arguments over what Marx actually meant, this one spiraled into low-key violence between the Chinese military and the USSR's border patrol. And like any good capitalist, the United States decided to monetize the discord. The best way to divide your enemies is to offer them your sweet military tech, at low, low prices.