Russia: Loss of Iranian nuclear deal would be 'unforgivable'
Russian ministry also says it was disappointed by plans by the US to extend its Iran Sanctions Act by 10 years.
Iran's President Hassan Rouhani (L) welcomes Russia's President Vladimir Putin during the Gas Exporting Countries Forum (GECF) in Tehran November 23, 2015(photo credit: REUTERS)ByREUTERSUpdated: