He came to say a big “thank you” to PetroChina, because he made lots of money from its stock. Also he came to Dalian, to celebrate the opening of his first company in China (a metalworking tool plant). The plant is a part of IMG group, a subsidiary of Berkshire Hathway. I would think IMG has lots of business in China these days, as China manufacturing industry is quite hot lately.
Interestingly China stock market took his warning (regarding Chinese market), and hold a sell off today. So, in Buffett we trust 🙂