Construction of Nord Stream 2 gas pipeline would not improve security of gas supply to the European Union (EU), Vice-President of the European Commission Maros Sefcovic said at the conference entitled "Nord Stream II – Energy Union at the crossroads" on Wednesday.

"Nord Stream 2 could lead to decreasing gas transportation corridors from three to at least two – abandoning the route through Ukraine. Also the Yamal route via Poland could be endangered. Such a reduction of routes would not improve security of supply," he said.

"Despite economic and political challenges, Ukraine continues to be a reliable gas partner and transit country. It is in the interest of all parties that Ukraine remains a significant gas transit corridor," he said.

EU Climate Action and Energy Commissioner Miguel Arias Canete at a meeting with Managing Director of Nord Stream AG and Nord Stream 2 Matthias Warnig and Board Chairman of Nord Stream AG Gerhard Schroder on Tuesday expressed alarm at the impact of Nord Stream 2 on security of supply, EU diversification strategy and the future of Ukrainian transit.