9. Is there a ban on donations from corporations with government contracts to political parties?

Section 2. Sources of Financing
(1) The political organisations (parties) may be financed from:
1) the membership fees and joining fees;
2) the gifts (donations) from natural persons;
3) the income earned by economic activities of the relevant political organisation (party);
3.1) the State budget - in cases specified in law;
Law on Financing of Political Organisations (Parties) Article 2.

This falls under the overall ban on legal entity donations. Therefore, legal entities (including corporations with govt. contracts) are banned as donors.