
Turkey
 The Turkish government has been one of the most strident  critics of Syrian President Bashar al-Assad since early on in the uprising. On  Monday Turkish Foreign Minister Ahmet Davutoglu told Turkey's Milliyet newspaper  that the country was ready to join an international coalition for action against  Syria even in the absence of agreement at the UN Security Council.
 Saudi Arabia and the Gulf
 The monarchies of the Gulf are said to  have been key in funding and supplying the rebel forces fighting against forces  loyal to President Assad. Saudi Arabia has been a rival of the Syrian government  for years and has been particularly active in pushing for action against Mr  Assad, with former Saudi ambassador to Washington Prince Bandar bin Sultan  reportedly trying in recent weeks to garner international support for further  support for the rebels.
 Israel
 Despite initially  avoiding becoming involved in the conflict, Israel has carried out three strikes  on targets in Syria this year, reportedly to prevent weapons shipments reaching  the Lebanese Hezbollah militia. Shelling and gunfire from Syria has also hit the  Israeli-occupied Golan Heights, drawing return Israeli fire.
 In  recent days, Israeli officials have condemned the alleged use of chemical  weapons by Syrian forces and hinted at support for military action. "Our finger  must always be on the pulse. Ours is a responsible finger and if necessary, it  will also be on the trigger," Israeli Prime Minister Benjamin Netanyahu said on  Sunday.
 However, Israeli officials will be aware that any Western  action against Syria risks a repeat of events in the first Gulf War in 1991,  when Iraq attacked Tel Aviv with Scud missiles in attempt to draw Israel into  the conflict and prompt the withdrawal of Arab countries from the war. Reports  say sales of gas masks in Israel have gone up in response to speculation over  military action.
 Lebanon
 The Lebanese Foreign  Minister Adana Mansour told Lebanese radio on Monday that he did not support the  idea of strikes on Syria, saying: "I don't think this action would serve peace,  stability and security in the region."
 Two bomb attacks which  killed almost 60 people in Lebanon this month were linked to tensions over the  Syrian conflict. The Lebanese Shia militant movement Hezbollah has openly taken  part in combat in Syria on the side of the government, and there have been  reports of some in the Sunni community fighting on the side of the rebels. In  addition, the country is already playing host to the largest number of Syrian  refugees of any country.
 Iran
 Iran has been Syria's  main backer in the region since well before the current conflict and has been  highly critical of any prospect of intervention.
 On Tuesday, Iran  warned a top UN official visiting Tehran of "serious consequences" of any  military action.
 Foreign ministry spokesman Abbas Araqchi also  repeated claims that it was in fact rebels who used chemical weapons, AFP  reports.
 Outside the region
 US
 Following  a cautious reaction to the initial reports of a chemical weapons attack,  American rhetoric has hardened in recent days. Secretary of State John Kerry  said the use of chemical weapons by the Syrian government was "undeniable" and a  "moral obscenity".
 Washington has recently bolstered its naval  presence in the eastern Mediterranean, prompting speculation that preparation  for an attack is underway. Analysts believe the most likely US action would be  sea-launched cruise missiles targeting Syrian military installations.
 US President Barack Obama had previously said the use of chemical weapons  would be a "red line"
 UK
 The UK is drawing up  contingency plans for military action, Prime Minster David Cameron's office has  said. Any action would be "proportionate", lawful and follow agreement with  international allies, a spokesman for Mr Cameron said.
 On Monday  Foreign Secretary William Hague told the BBC that diplomatic pressure on Syria  had failed and that the UK, "the United States, and many other countries  including France, are clear that we can't allow the idea in the 21st Century  that chemical weapons can be used with impunity".
 France
 The day after the reports of the attack near Damascus, French Foreign Minister  Laurent Fabius called for "a reaction of force" if the use of chemical weapons  was proven. He has also suggested that the UN Security Council could be bypassed  "in certain circumstances".
 France has been amongst the most  hawkish Western countries with regard to Syria, being the first Western power to  recognise the main opposition coalition as the Syrian people's legitimate  representative. In May France, along with the UK, successfully lobbied for the  EU's arms embargo to be lifted so as to allow further supplies to the  rebels.
 Russia
 Russia is one of Mr Assad's most  important international backers and has stressed the need for a political  solution to be found to the crisis.
 It has sharply criticised any  possibility of Western strikes on Syria, saying action taken outside the  security council threatened "catastrophic consequences for other countries of  the Middle East and Northern Africa".
 China
 China has  joined Russia in blocking resolutions critical of Syria at the UN Security  Council. It has also criticised the prospect of strikes against Syria.
 The official Chinese news agency, Xinhua, said Western powers were rushing to  conclusions about who might have used chemical weapons in Syria before UN  inspectors had completed their investigation.