Ukraine's state energy firm Naftogaz on Friday said the Swiss Supreme Court has rejected a motion from Russia's Gazprom GAZP.MM to overturn a June 2025 ruling on the payment of $1.4 billion to Naftogaz.

In June 2025, a Swiss arbitration tribunal ordered Gazprom to pay debt for gas transportation services, along with interest and arbitration costs, Naftogaz said.

"Thus, Switzerland's highest court upheld the validity of the arbitral award and definitively rejected the arguments of the Russian side," Naftogaz quoted its CEO Serhiy Koretskyi as saying.

Naftogaz will continue to work on the enforcement of the decision, Koretskyi added.

-Anna Pruchnicka/Reuters