Last week, Israel struck four buildings at the Isfahan nuclear site, among them a uranium conversion facility. The IAEA said there has been no sign of increased radiation at Isfahan, which is roughly 350 kilometers (215 miles) southeast of Tehran.

MOSCOW (Reuters) -Potential use of tactical nuclear weapons by the United States in Iran would be a catastrophic development, Russian state news agency TASS quoted Kremlin spokesman Dmitry Peskov as saying on Friday.

The Russian foreign ministry’s spokesperson, Maria Zakharova said at a briefing that Russia is particularly concerned about security of the plant in Iran’s southern port of Bushehr and the Russian personnel there.