Chinese Foreign Minister Wang Yi on Sunday called on all sides to seize the opportunity to show flexibility and political decision to push the Iranian nuclear negotiations into fruition.

Wang arrived in Lausanne on Sunday morning and made the remarks during an one-hour bilateral talks with Iranian Foreign Minister Mohammad Javad Zarif.

"Important progress have been made in the Iranian nuclear talks, and it is in every party's interests, including Iran, to reach a comprehensive agreement," Wang said.

China, which upholds a fair, objective stance, will continue to contribute positive efforts to advance the negotiations, he added.

During the talks with US Secretary of State John Kerry, Wang called on all sides to seek negotiation room amid focused sticking points, and to bridge gaps to find solutions which are acceptable to all parties.

Wang also held intensive bilateral talks with his counterparts from France, Germany, European Union and Russia to negotiate towards Teheran's potential framework deal.

He said the marathon talks has entered the home stretch, all sides should work together to make a decisive political decision.

Since Saturday, foreign ministers from six major countries and Iran joined the Iranian nuclear talks in their final efforts to hammer out a framework agreement before the March 31 deadline.