1. Is there a ban on donations from foreign interests to political parties?

Iran, Islamic Republic of
Answer
Yes
Source
The Transparency, Supervision, and Financing of Parliament (Majles) Election Activities Law (Art. 65(8) note 1)
Law amended, January 12, 2020 Reference: https://perma.cc/DJD4-P8WR
Comment
Candidates and political parties and groups are not entitled to any material or immaterial assistance to persons who have non-Iranian citizenship or to persons