"There have been different, very different opinions and positions regarding the list of invitations. That has been the issue, the stalemate, so far," said the UN Special Envoy for Syria, Staffan de Mistura.
"And the date in which we are aiming at having the beginning of the Intra-Syrian talks is 29th of January," he said of the peace talks that will be held in the UN's European headquarters in Geneva.
The UN-sponsored talks, earlier scheduled to start today were re-scheduled after disagreements among the 17-nation International Syria Support Group (ISSG) on who should represent the Syrian opposition.
The talks are structured as "proximity talks" spread over six months, on a "staggered, chronological, proximity approach".
Also Read
The Security Council had passed a resolution in December last year that supports international efforts to seek a political solution in Syria and recognised the International Syria Support Group (ISSG) as the main body dealing with the Syria peace process. The resolution also calls for a ceasefire between the regime and its opposition in Syria in six months.
The talks will aim at a Syrian-led and Syrian-owned political transition - objectives of which include credible, inclusive governance within six months, scheduling the drafting of a new Constitution and free and fair elections within 18 months of drafting the Constitution. But the immediate focus of the talks would be a broad ceasefire.
Though al-Nusra and IS (Islamic State) - two deadly groups unleashing terror in Syria - will not be a part of the talks, "but there are plenty of other suspensions of fighting that can take place" if a ceasefire is actually agreed upon, the UN envoy for Syria said.
The deadly civil war in Syria, now in its fifth year, has had catastrophic humanitarian consequences.
The UNHCR has recorded 4.5 million registered Syrian refugees including 2.1 million Syrians in Egypt, Iraq, Jordan and Lebanon, 1.9 million Syrians registered by Turkey, and more than 26,700 Syrian refugees registered in North Africa.
Additionally, the war has internally displaced 7.6 million people within the boundaries of their beleaguered homeland.
The protracted crisis in the West Asian nation has been a major cause for pushing up global forced displacement numbers to exceed 60 million last year - the largest movement of people seen since World War II.