For Ukraine to lose western Donetsk would mean the fall of a bulwark against any future Russian advance.

Putin has reportedly demanded full control of industrial region but Kyiv is set against ceding any territory

For Ukraine to lose western Donetsk would mean the fall of a bulwark against any future Russian advance.

In the most detailed Russian-based reporting to date on Putin's offer at the summit, Reuters was able to outline the contours of what the Kremlin would like to see in a possible…