China says next stage of US-Iran talks will be ‘more difficult’ China's Foreign Minister Wang Yi has warned that future negotiations between Tehran and Washington are likely to face greater challenges, saying the next phase of talks will be "more difficult" than the initial stage. Speaking to Pakistan's Foreign Minister Ishaq Dar, Wang said that while recent diplomatic progress was welcome, significant hurdles remained. "The current consensus is far from the final destination, rather it is a new starting point," Wang said, according to a statement from China's foreign ministry.