The international envoy to Syria has called for the formation of a Syrian National Unity Government with full executive powers until elections can be held in a bid to end the crisis there.

Speaking in Damascus, Lakhdar Brahimi said that there needed to be real change and a swift political end to the crisis.

"This situation in Syria now forms a huge danger, not only for Syrian people, but for the neighbouring countries, and for the world," he said.

"Time is not in the favour of anyone, and I hope that everyone who has the ability to help in getting Syria out of this adversity that Syria finds itself in, should not spare any effort," he added.

Earlier today, Syrian diplomats entered Russia's foreign ministry in Moscow for talks following a diplomatic push by Mr Brahimi this week.

Mr Brahimi will fly to Moscow on Saturday for talks with Russian Foreign Minister Sergei Lavrov on how to end Syria's 21-month-old conflict.

More than 44,000 Syrians have been killed in a revolt against four decades of Assad family rule, a conflict that began with peaceful protests in March last year, but which has descended into civil war.