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

Canada
Subsection 363(1): “No person or entity other than an individual who is a Canadian citizen or is a permanent resident as defined in subsection 2(1) of the Immigration and Refugee Protection Act shall make a contribution to a registered party, a registered association, a nomination contestant, a candidate or a leadership contestant.”
(Canada Elections Act, 2000 - last amended on 29 June 2021).