5. Is there a ban on donations from Trade Unions to political parties?

Source:

Article 1, Law "On Trade Unions, their rights and guarantees of activity" (1999)

(UK)

У цьому Законі застосовуються такі терміни:
професійна спілка (профспілка) - добровільна неприбуткова громадська організація, що об'єднує громадян, пов'язаних спільними інтересами за родом їх професійної (трудової) діяльності (навчання).

(EN) 
1. In this Law, the terms are used in the following sense:
professional union (Trade Union) - a voluntary non-profit public organization that brings together citizens who share common interests based on their professional (labor) activities (education).
Available at: 

https://zakon.rada.gov.ua/laws/show/1045-14#Text

Source:

Article 1, Law "On Public Associations" (2013)

(UK)
2. Громадське об'єднання за організаційно-правовою формою утворюється як громадська організація або громадська спілка.

(EN)
2. According to its organisational and legal form, a public association shall be formed as a public organisation or public union.
Available at: 

https://zakon.rada.gov.ua/laws/show/4572-17#Text

Source:

Article 15, Law "On Political Parties in Ukraine" (2001)

(UK)

Не допускається здійснення внесків на підтримку політичних партій:
6) незареєстрованими громадськими об’єднаннями, благодійними чи релігійними організаціями, а також іншими політичними партіями.

(EN)
Donations in support of political parties shall be prohibited if they are made by:
6) unregistered civil society organizations, charitable and religious organizations, as well as other political parties
Available at: 

https://zakon.rada.gov.ua/laws/show/2365-14#Text

Ukrainian law doesn't ban donations from Trade Unions to political parties. According to the law, a Trade Union is a public organization, which is a type of public association. However, only unregistered public associations are banned from donating to political parties, so there's no direct ban.

In national (parliamentary and presidential) elections, restrictions are applied under the Law “On Political Parties in Ukraine,” which also applies during the inter-election period. In particular, Article 15 of the Law “On Political Parties in Ukraine” refers to: Part 1, 3 of Article 96 of the Electoral Code of Ukraine (restrictions on entities in presidential elections), Part 2 of Article 96 of the Electoral Code of Ukraine (restrictions on the size of contributions in presidential elections); Parts 1 and 3 of Article 152 of the Electoral Code of Ukraine (restrictions on entities in parliamentary elections), Part 2 of Article 152 of the Electoral Code of Ukraine (restrictions on the size of contributions in parliamentary elections)