The two leaders in Cyprus have agreed to meet again this month as part as a prelude to fully fledged peace talks. There is still unease on the Greek Cypriot side that not enough progress has been made on finding common ground between the two sides. Greed Cypriot president Demetris Christofias is believed to be unhappy about how much has been achieved by the 13 working groups and technical committees and wary of starting talks without a framework. But Mehmet Ali Talat, the TRNC president, is eager to press ahead and deal with any issues as they come up. Both leaders will meet again on July 25. United Nations Special Representative Taye-Brook Zerihoun, who was at the four and a half hour long talks on Tuesday, said the atmosphere had been “positive and co - operative”. He said the leaders had under taken a first review of what has been achieved by the working groups and technical committees, as well as agreeing “on principle” to the issue of single sovereignty and citizenship. The two leaders “discussed the issues of single sovereignty and citizenship and they agreed in principle,” said the joint statement read out by Mr Zerihoun. They agreed to discuss the details of the implementation during the fully fledged negotiations. “They agreed to meet on July 25 when they will undertake the final review of the working groups and technical committees before the launch of fully fledged talks,” the statement added. The citizenship issue has been a major concern for the Greek Cypriots who have sought to limit how many mainland Turks who have settled in the north of the island since Turkeys 1974 intervention should be naturalized. The Sovereignty issue in turn has been a key concern for the Turkish Cypriots, who have demanded that the bizonal, bicommunal federation foreseen in the UN-brokered peace talks must be an entirely new creation. The Greek Cypriots by contrast have argued that if should be a continuation of their Cyprus Republic, which is currently recognized by every government except Ankara. UN spokesman Jose Diaz hailed the progress made in the meeting. “It’s a positive statement and moves us forward on what is seen as a complicated issue,” he said. “Before the meeting it was not a foregone conclusion that the leaders would reach agreement.” Diplomats had been keen to see progress from Tuesday’s meeting - the third between the two leaders in as many months - as the momentum in the reunification process had been slowing. It is also believed Mr Talat and Mr Christofias talked about the recent memorandum of understanding between South Cyprus and Britian. Mr Talat snubbed a dinner invitation with Mr Christofias because of the accord last month. The TRNC government is unhappy that the memorandum included issues concerning the Turkish Cypriots.