MOSCOW, September 30 (RIA Novosti) - Russia reiterated on Wednesday that it expected Iran to cooperate fully with the International Atomic Energy Agency (IAEA) over its nuclear program.

Russia, which has traditionally supported Iran in the long-running dispute, voiced concern at last week's G20 summit in Pittsburgh over the revelation of a second Iranian enrichment site, and urged Tehran to provide reassurances over its nuclear program.

"The situation has not changed since Pittsburgh," presidential spokeswoman Natalia Timakova told journalists.

She also said that Russia was expecting "the same as everyone else" from Iran. "Full cooperation with the IAEA, the fulfillment of all its international obligations and complete information about its nuclear program."

Western powers suspect Iran of attempting to build nuclear weapons. Tehran says its nuclear program is aimed at generating peaceful civilian energy.

The U.S. and Britain have refused to rule out military action against the Islamic Republic over its nuclear program.

As tensions grow, Iran's national media said on Monday the country had test launched the longest-range missile in its arsenal, a Sajjil surface-to-surface missile with a range of up to 2,000-2,500 kilometers, capable of striking Israel and parts of Europe.

The Iran Six negotiating group of Russia, Britain, China, France, Germany and the U.S. is set to hold talks with Tehran on Thursday.