Vinatier, who works for a Swiss conflict mediation group, was detained as ties between France and Russia deteriorated.
Le Pen and her RN party have been accused of using European Parliament money to pay staff in France.
Czeslaw Kukuczka was shot in the back as he tried to flee from East Germany via the Berlin Wall on March 29, 1974.
If the court does not issue arrest warrants for Israel’s Netanyahu and Gallant, it will lose its legitimacy.