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

Source:

Article 19, Loi n° 91-97 du 12 avril 1991 portant charte des partis politiques:

Le montant des ressources éventuelles provenant de l’extérieur ne doit pas excéder 25% du montant total des ressources du parti.

There is no ban on foreign donations, but resources from external sources – not necessarily donations - are limited to not more than 25% of the party budget.