What it would really take to stop Putin fighting in Ukraine

As peace talks continue in Berlin, what - if anything - could potentially change Putin's mind? And could Europe do anything differently?

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The late US Senator John McCain used to joke that when he looked into Putin's eyes, he saw three things, "a K and a G and a B", a reference to his past life as a Soviet intelligence officer.

I thought of this as I watched footage of Russia's leader sitting opposite American envoys in the Kremlin. He could not hide his emotions; he exuded an air of supreme confidence.

For President Putin reckons the diplomatic tide has turned in his favour, with an improved relationship with America and gains on the battlefield.

Some analysts say Putin has no incentive to retreat from his demands: that Ukraine gives up the last 20% of Donetsk it still controls; that all occupied territory is recognised internationally as Russian; that Ukraine's army is curtailed to a point of impotence; and Nato membership is ruled out forever.