Section 5

(1) A witness, on whom a summons to appear issued by the International Criminal Court has been served in Finland, for the purpose of hearing before the Court, shall be under an obligation to comply with the summons.
(2) The Finnish authorities must take the necessary measures in order to facilitate the possibility of the witness to comply with the summons.

Section 6

(1) A witness, who has been summoned in Finland to be heard before the International Criminal Court, shall have a right to compensation in advance in accordance with the provisions on advance compensation in the State Compensation for Witnesses Act (666/1972), where applicable.
(2) A request for advance compensation shall be made to the district court which served the summons on the witness. A decision on the award of compensation in advance shall be made by the Ministry of Justice on the basis of a request of the district court.
(3) A compensation paid in advance may only be recovered from a witness who fails to appear before the Court or otherwise fails to fulfil his duties before the Court. A decision on the recovery of compensation shall be made by the district court referred to in paragraph (2) on the basis of a request of the Ministry of Justice.

Article 93
Other forms of cooperation
1. States Parties shall, in accordance with the provisions of this Part and under procedures of national law, comply with requests by the Court to provide the following assistance in relation to investigations or prosecutions:
(e) Facilitating the voluntary appearance of persons as witnesses or experts before the Court