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

Ecuador
Answer
Yes
Source
Ley Orgánica Electoral, Código de la Democracia Art. 360.- Se prohíbe a las organizaciones políticas recibir, directa o indirectamente, aportes económicos (...) de empresas, instituciones o Estados extranjeros. (…)
Comment
Corporations, institutions or foreign States are banned to donate to political parties.