“Negotiations need to begin in the next two months before it creates upheavals and tensions that will not be easily overcome. Ideally, the dividing line should be a return to the status quo ante. Pursuing the war beyond that point would not be about the freedom of Ukraine, but a new war against Russia itself,” he said.

He told the World Economic Forum that Russia had been an essential part of Europe for 400 years and had been the guarantor of the European balance of power structure at critical times. European leaders should not lose sight of the longer term relationship, and nor should they risk pushing Russia into a permanent alliance with China.

“I hope the Ukrainians will match the heroism they have shown with wisdom,” he said, adding with his famous sense of realpolitik that the proper role for the country is to be a neutral buffer state rather than the frontier of Europe.