The leaders of Cyprus are meeting in Geneva for UN-led talks, with optimism that they can reach a settlement to end decades of division. The UN envoy in Geneva said Greek Cypriot leader Nicos Anastasiades and his Turkish Cypriot counterpart Mustafa Akinci "really want to make this work". Previous attempts at reunifying the island have failed.
The aim is to create some kind of united but federal Cyprus where power is shared between the two communities. Cyprus has been split since Turkish troops invaded in 1974, following an Athens-inspired coup by Greek Cypriots seeking union with Greece. The northern third of the island is inhabited by Turkish Cypriots and the southern two-thirds by Greek Cypriots.
Cyprus country profile
Both leaders, said by diplomats to be genuinely committed to achieving a deal, acknowledge that there are key issues that still need to be thrashed out.
But if they make progress, leaders from the three countries that currently guarantee Cyprus's security - Britain, Greece and Turkey - will join the talks.
New UN Secretary-General Antonio Guterres, who has spoken of an "historic opportunity" for a breakthrough, will also be Geneva. UN envoy Espen Barth Eide said the two leaders still had some obstacles, but had "demonstrated a degree of will and leadership that we haven't seen for a very, very long time in Cyprus. The neighbours including Greece and Turkey seems to be willing to be helpful, maybe even more this time than before".
Talks have already been going on for some 19 months and significant stumbling blocks remain.
What are the sticking points?
Property: Top of the agenda at Monday's talks was what should happen to the properties that Greek Cypriots had to abandon in 1974? Should they get the right to take their old homes back or be compensated and if so by how much?
Security: How can the security of the Turkish Cypriots be guaranteed if Turkey's estimated 30,000 troops leave? Greek Cypriots see them as an occupying force so should some stay or should Turkey retain the right to intervene?
Who would act as a guarantor of the deal. The EU of which Cyprus is already a member - or the UK, which has two military bases on the island?
Power and the role of the EU: There is talk of a rotating presidency but how would that work and could a Turkish Cypriot president really represent the country from time to time at EU summits?
Territory: How much more territory should Greek Cypriots gain to reflect the fact that they make up the majority of the island's population? UN peacekeeping forces estimate that 165,000 Greek Cypriots fled or were expelled from the north, and 45,000 Turkish Cypriots from the south, although the parties to the conflict say the figures are higher.
Any deal reached in Geneva would also have to backed by both communities in separate referendums later this year. An earlier UN reunification was backed in 2004 by a majority of Turkish Cypriots but overwhelmingly rejected by Greek Cypriots.