There is the story about a man who invented a way to coat glass with diamonds. He was negotiating to sell his invention to Huawei when they shipped one of his samples to China even though he instructed them not to because it was export controlled technology. The reason it is export controlled is that such an invention has applications in military laser weapons. I am summarizing from memory but you can read this article to learn more.

https://www.bloomberg.com/news/features/2019-02-04/huawei-st...