European and Ukrainian negotiators were on Sunday locked in talks with US officials in a bid to amend the details of a peace plan proposed by Washington this week which they deem highly favourable to Russia.

The US is pressing Kyiv to accept a 28-point agreement, which is loosely framed and short on detail, by Thursday. The draft incorporates several long-standing Russian demands, while breaching Kyiv’s clear red lines and sidestepping European security concerns.

US officials describe the plan as a working document. But turning it into something more acceptable for Ukraine and its European allies will be a mammoth diplomatic undertaking. Here we look at issues where differences will be extremely difficult to bridge and others where compromise may prove less hard to find.