Russia and China are urging Iran to cooperate with the InternationalAtomic Energy Agency on any probe of its newly revealed uraniumenrichment plant.
In a statement Friday, Russian PresidentDmitri Medvedev said disclosure of the site is a cause for "seriousconcern." But he did not raise the threat of sanctions.
A Chinese spokesman says China is following the situation closely.
U.S.President Barack Obama and other Western leaders have insisted the IAEAgain immediate access to the facility to ensure it is not being builtto produce atomic weapons.
Russia and China are two of the fivepermanent members of the United Nations Security Council, but havehistorically been more reluctant than the United States and Europeannations to punish Iran for enriching uranium.
TheSecurity Council has passed three sets of sanctions urging Iran to halturanium enrichment, a process that can be used to make nuclear weapons.