Iran nuclear talks: What China brings to the negotiating table

China's foreign minister, who joined the talks over the weekend, is reportedly proposing a compromise between Iran's insistence on an end to all UN sanctions and US desires for gradual relief. 

Brendan Smialowski/AP

As Tuesday’s deadline for a deal on Iran’s nuclear program loomed, Chinese Foreign Minister Wang Yi joined the talks in Lausanne on Sunday in typically low-key fashion.