"We plan to lodge an appeal in early June," he said, adding that the Ukrainian government will insist on its position.
"Our position has not changed," he stressed.
The London High Court ruled in March that the case should not go to a full trial, which is a partial win for Russia, but gave Ukraine the right to appeal.
The $3 billion sovereign bond debt was secured by former Ukrainian President Viktor Yanukovych's government in late 2013. Russia has repeatedly stated that Ukraine's failure to pay back the debt should be classified as a default.
Russia filed the lawsuit against Ukraine with the court in February 2016, demanding the repayment of the $3-billion principal and unpaid interest accumulated starting from the Eurobond's maturity date in December 2015.
Never miss a story again — sign up to our Telegram channel and we'll keep you up to speed!
