Ukrainian energy company Naftogaz said on Friday it had approached bondholders with an offer to “increase cooperation” to try to resolve disputes after it defaulted on debt, Reuters reported.

“One of our key priorities is to restore confidence in Naftogaz, especially among our investors. The proposal to return to a constructive dialogue is the first step in this direction,” said Oleksiy Chernisov, head of Naftogaz.

In a statement on the Naftogaz website, it was also confirmed that the company appointed the financial consulting company Lazard as its “exclusive financial advisor.”

At the beginning of the month, the Ukrainian government accepted the resignation of Yury Vitrenka from the position of general director of Naftogaz.

In addition to the energy difficulties facing the country, Naftogaz is also locked in a legal dispute with Russian state energy company Gazprom over the transit of Russian gas through Ukraine.

The dispute is older and at one point in the late 2010s led to an energy crisis in the middle of winter due to misunderstandings over transit fees.

Then Gazprom stopped supplying gas to Europe, which was mostly carried out through pipelines running through Ukraine, and since then there has been talk of Moscow’s tactics of using energy as a weapon.