KYIV, April 16 - The Ukrainian natural gas transit route is strategic for the EU's energy security, and Germany's involvement in finding a solution that would safeguard its commercial viability is much appreciated and needed, European Commission Vice President for Energy Union Maros Sefcovic has said.

"I could envisage a quadrilogue as a political impulse for negotiations with Ukraine," he wrote on Twitter after a meeting with German Minister for Economic Affairs and Energy Peter Altmaier on Monday.