The effectiveness of additional sanctions against Tehran over its nuclear program is "doubtful," a Russian Foreign Ministry deputy said on Saturday.

Iran Six participants holding a meeting in New York on Saturday decided against new sanctions on Tehran and will study new political methods to solve the issues.

"I believe that in this particular situation, the effectiveness of [additional] sanctions is highly doubtful," Sergei Ryabkov told journalists after the Iran Six meeting in New York.

He said that the participants at the meeting have come to the point when the Western participants will begin taking concrete steps in solving the Iranian nuclear issue.

Iran is under a number of UN sanctions because of its nuclear ambitions. The West believes Tehran is pursuing a nuclear program to make weapons, an accusation Iran has denied.

The Iran Six consists Russia, the U.S., China, Britain, France, and Germany.