"Someone might view the current situation as a window of opportunity and cynically follow the path of regime changing in Teheran. But Russia will not join such a course of action and at no degree shares political and judicial responsibility for these moves," Ryabkov said in an interview published in the Index Bezopasnosti (Security Index) magazine.

He said sanctions against Iran have been exhausted and Moscow calls for alternative ways of serious negotiations with Iran, searching for compromises and decision that Iran could be interested in.

Ryabkov added that it is true that Iran is advancing its nuclear program and limits its cooperation with the International Atomic Energy Agency (IAEA), but Russia believes there is no evidence so far to demonstrate Iranian nuclear program has a military dimension.

"We are in the immediate vicinity of Iran, and an Iran with nuclear weapons is not an option for Russia," Ryabkov said.

Iran has activated upgraded centrifuges at its nuclear facilities for uranium enrichment, reported the Iranian news agency Pars on Wednesday. Analysts warned this may cause concerns and bring possible sanctions from the West.