A Russian company is suing the political party led by French far-right politician Marine Le Pen, to recover a loan lent in 2014 to help her fund election campaign.

An investigative website reported that Le Pen’s party took out €9.4 million in 2014 from the Moscow-based First Czech-Russian Bank. However, in 2016, the bank lost its license and the loan was sold to a car rental agency called Konti.

Konti then transferred the right to claim the loan to another Russian aircraft parts company, A...