"There are different ideas on the table, I hope you will be positively surprised," he told journalists.
Russian Foreign Minister Sergei Lavrov is expected to join the talks in Lausanne Tuesday afternoon, Ryabkov added.
Tuesday marks the last day of this stage of the negotiations between Iran and P5+1 group, comprising envoys from United States, Britain, France, China, Russia and Germany. The group's self-imposed deadline for reaching a framework on negotiating Tehran's disputed nuclear program is Tuesday, March 31.
Earlier in the day, Russian Foreign Minister Sergei Lavrov stated that he believed that there was a high chance that the talks would be successful, adding that he was planning to return to Lausanne for the final ministerial meeting.
The P5+1 group of international mediators are attempting to convince Iran to halt its uranium enrichment program for more than ten years and decrease the number of centrifuges in the country.
Initially, Tehran insisted on having at least 10,000 centrifuges, but in February agreed to consider a US proposal of cutting the number to 6,500.
Iran and the P5+1 group have held several rounds of talks on Tehran's nuclear program since November 2013 with limited results. The negotiators are now working towards the July 1 deadline to forge a final agreement.
