Pressure is mounting on Syria -- but varying opinions are being voiced by world powers on how to resolve the crisis. France is looking to set up "humanitarian corridors" to alleviate civilian suffering. Meanwhile, the US has anchored an aircraft carrier off the Syrian coast. But China and Russia are calling for dialogue to resolve the crisis. Paul Crowe take a look.

Syria’s neighboring country Turkey is on high alert.

The Syrian government this week once again provided a training camp on the border for the Kurdistan Workers’ Party, the PKK. Turkey is warning Syria not to use the PKK against Turkey.

Meanwhile, Turkey and the US are urging their citizens to leave Syria. The US released a statement on Wednesday urging Americans to depart while commercial transport is still available.

Adding to the complexity of the situation is the arrival off the coast of Syria of the USS George H-W Bush Aircraft Carrier. Analysts say it’s a sign of pressure from the US; and that the possibility of intervention in Syria is growing.

France is the first major power to seek international intervention, calling for "humanitarian corridors" that would allow the transport of aid supplies to civilians.

French Foreign Minister Alain Juppe met the head of the opposition Syrian National Council in Paris on Wednesday. He said the plan falls short of military intervention, but acknowledges that humanitarian convoys would need armed protection.

But Russia has expressed opposition to any military intervention, while China is urging dialogue as a way of achieving a peaceful resolution to the crisis.

And after a meeting in Moscow on Thursday, Russia, China, Brazil, India and South Africa, issued a warning against any foreign intervention without UN backing.