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

Political Parties Act 1994, amended 2015, Section 25 (2)(3).

There is however a limit on how much foreigners may contribute which is EUR 1,000.

The following shall be excluded from the right of political parties to accept donations: [...] donations from sources outside the territorial scope of this Act unless: a) these donations accrue directly to a political party from the assets of a German as defined by the Basic Law, of a citizen of the European Union, or of a business enterprise, of whose shares more than 50 per cent are owned by Germans as defined by the Basic Law or by a citizen of the European Union or whose registered office is located in a Member State of the European Union; b) they are donations transferred to parties of national minorities in their traditional settlement areas from countries which are adjacent to the Federal Republic of Germany and where members of their ethnic group live; or c) it is a donation not exceeding 1,000 euros made by a foreignerThere is however a limit on how much foreigners may contribute which is EUR 1,000. The following shall be excluded from the right of political parties to accept donations: [...] donations from sources outside the territorial scope of this Act unless: a) these donations accrue directly to a political party from the assets of a German as defined by the Basic Law, of a citizen of the European Union, or of a business enterprise, of whose shares more than 50 per cent are owned by Germans as defined by the Basic Law or by a citizen of the European Union or whose registered office is located in a Member State of the European Union; b) they are donations transferred to parties of national minorities in their traditional settlement areas from countries which are adjacent to the Federal Republic of Germany and where members of their ethnic group live; or c) it is a donation not exceeding 1,000 euros made by a foreigner