For seven years, a war has been going on in eastern Ukraine and now Russia is accused by the West of threatening an invasion. Since war in the east broke out in April 2014, more than 14,000 people have died. There are fundamental differences in the Russian and Ukrainian positions. But the major dispute centres on a political settlement for the Donbas. The two countries have "irreconcilable" views on the future of the war-torn areas in eastern Ukraine, says Duncan Allan, an associate fellow at Chatham House. Ukraine wants to restore its sovereignty and territorial integrity while Russia, he believes,...