From China Daily (link):
China is sending a special envoy to Teheran today to help defuse the Iranian nuclear crisis, the Foreign Ministry announced yesterday.
Assistant Foreign Minister Cui Tiankai “will exchange views with Iranian and Russian diplomats (later in Moscow) on the Iran nuclear issue and other issues of common concern,” ministry spokesman Liu Jianchao said. “The visit aims at stepping up exchanges with all parties concerned in a bid to help resolve the nuclear issue,” Liu said.
See also “China to send envoy to Iran, urges restraint” from Reuters.