国际英语新闻：Iran hopes Russia's next step be delivery of S-300 missiles system: MP

"The U.S. also pressed its European allies to take the same measures (of sanctioning) against Iran. They also put Russia under pressure to prevent loading Bushehr nuclear plant," Boroujerdi told ISNA.

Russia's move ensured Iranians that it abides by its commitments and public opinion in Iran, he said, adding that " Russia (should) implement its obligations on S-300 missile system as well."

After years of delay, Russians completed the construction of Bushehr nuclear plant, which began in 1975 by German companies but was halted after the United States imposed embargo on hi-tech supplies to Iran following Iran's 1979 revolution.

Russia signed a contract with Tehran in 1995 to complete the construction.

Iran and Russia started on Saturday to load fuel rods to a reactor at Iran's first nuclear power plant.