"Russia is seriously concerned by the latest statements of the Iranian leadership," the source was quoted as saying.
Iran announced plans on Sunday to build 10 new uranium enrichment plants in a major expansion of its atomic programme, just days after the U.N. nuclear watchdog rebuked it for carrying out such work in secret. (Reporting by Oleg Shchedrov, writing by Guy Faulconbridge, editing by Dmitry Solovyov)