“The Iranian ambassador today (January 13 - RT ) was called to the Foreign Ministry to express our strong protest. The detention was an unacceptable violation of the Vienna Convention, it must be investigated, ”RIA Novosti quoted a representative of the Cabinet.

London also demanded guarantees from Tehran that "this will not happen again."

Makair was detained on January 11 in Tehran at a university rally.

According to him, he came to the memorial service for the victims of the crash of a Ukrainian passenger plane, shot down by mistake on January 8 by the Iranian military.

The Iranian Foreign Ministry said that the British ambassador was detained as an unknown foreigner at an illegal meeting and released 15 minutes later when his status was officially confirmed.

The Foreign Ministry of Britain, Germany, as well as the European Union condemned the detention of a diplomat.