As far as China is concerned, they picked up food imports massively last year because of the huge floods along the Yangtze. This was largely unreported in Western media. The Three Gorges Damn was releasing far more water than it should have downstream in order to prevent damn collapses and catastrophic flooding further upstream, net result being harvests being wiped out downstream. Prices for staples such as corn, wheat, and pork went through the roof. That's why the US was exporting so much to China.Damn, that sounds horrible.
But it would also explain many things that happened recently.
Why are they doing that?