Head of the Atomic Energy Organization of Iran Mohammad Eslami. Photo: IRNA/TTXVN

Political pressure and actions to undermine the process of agreement and negotiations will definitely be met by Iran’s reciprocal action, the Iranian official said.

Iran said on Tuesday that it was enriching uranium to 60% purity at its Fordow nuclear plant in response to a resolution passed by the IAEA.

The UK, France, and Germany issued a joint statement expressing concern about Iran's nuclear program, while the US expressed its own concern about steps Iran has taken to upgrade its nuclear capability.