"When there is something to talk about we will come back. The European Commission and Ukraine need to resolve a number of issues related to funding and there is no sense to continue in a trilateral format," he said.
Answering the question whether Gazprom plans to continue the negotiations in the upcoming hours, he replied: "No, we are waiting for information that there is progress on bilateral EU-Ukraine Protocol and then we fly out."
"It could be today," Kupriyanov said.
Thus, Energy Minister Alexander Novak remained in Brussels from the Russian side. He will agree the draft of the document, developed by Ukraine and the EC.
Earlier, the minister said that the Russian side demands that Ukraine and the EU agree the text of a bilateral protocol between them and prepare it for signing.
The documents signed by Russia - protocol between Russia, Ukraine and the European Commission, and addendums to the contract between Gazprom and Naftogaz - are essentially agreed, Novak added.