2. Is there a ban on donations from foreign interests to candidates?

The sources of funding of the election campaign of a single candidate include:
1) donations made on the terms and conditions laid down in this Act;
2) personal property of the single candidate.
Source: § 5.2(3), Political Parties Act, 1994 (amended 2014)

A donation that does not comply with the terms and conditions laid down in subsection (1) of this section is prohibited. Above all, the following is prohibited: […]
8) donations by aliens, except for donations by persons holding the permanent right of residence or the status of a long-term resident in Estonia. […]
Source: § 12.3(2), Political Parties Act, 1994 (amended 2014)

There is a ban on donations from foreign interests, except for donations by persons holding the permanent right of residence or the status of a long-term resident in Estonia