This begs the question, whether the S-300 has been used in Iran (the Russians control it), and whether the S-400 would fall in the same question.  “Russian ambassador says ‘no problem’ selling S-400 to Iran when arms ban expires,” Times of Israel, October 4, 2020.

“A Tripartite Arrangement in Lebanon under Iranian Conditions,” Eyad Abu Shakra, Asharq al-Awsat, October 4, 2020.

“According to Northern German Broadcasting, roughly 150 demonstrators called on the city government to end its contract with the Islamic Center of Hamburg and close the controversial institution, which is controlled by Supreme Leader of the Islamic Republic of Iran Ali Khamenei.Local Green Party politician Gudrun Schittek spoke at the rally, saying: “This is not a normal mosque here: It is the propaganda headquarters of the regime in Tehran and we have to protest against this mullah regime. We have to protest against the fact that the Islamic Center Hamburg, as part of the Shura, is a member and contractual partner in state agreements with the city of Hamburg that should not be allowed – and we have to clearly define ourselves as a democracy.””  See “Demonstrators seek Merkel’s support for democratic forces in Iran and to join US sanctions against Iran’s regime,” Benjamin Weinthal, Jerusalem Post, October 4, 2020.