A foreign trading subsidiary of Russian state-controlled gas monopoly Gazprom has finally paid compensation of $1.5 billion to Poland’s state oil and gas company PGNiG after an earlier arbitration ruling.

PGNiG was awarded the compensation after an international arbitration tribunal in Stockholm ruled in March that, being a sole supplier, Gazprom had pushed the Polish company to pay higher than average market prices for Russian gas deliveries.

Gazprom Export said it will still appeal against the ruling that both companies filed with Svea Court of Appeal in Stockholm in May.