The United States trade negotiators have been urging China to play a larger role in the Doha round, but I doubt this was what they were looking for:

The main stumbling block in the Doha Round of global trade talks is the failure of the United States and European Union to make substantial concessions on agriculture, China’s commerce minister said on Monday… ”The European Union and the United States, as the world’s two largest traders, have yet to make substantial concessions in terms of high import tariffs on agricultural products, export subsidies for agriculture and the huge domestic support for their agricultural products,” Mr Bo said.

Mr Bo, speaking on the sidelines of the annual session of the National People’s Congress, the largely ceremonial parliament, also urged Japan to do more to reduce its tariffs on farm goods, which he said were nearly three times higher than China’s.