I ran across articles from last year finding that protein powders made in China also have melamine (soy, whey, albumin). The stories didn’t get much traction, at least in the U.S.
Important to note that ingredients used in “American” food products may have been imported from China.
I heard an FDA spokesman on the news this morning trying to explain away any danger by saying that our food comes into melamine all the time in our homes.
What she didn’t mention that the melamine used in things like countertops is “fixed” meaning that it doesn’t leach into food.