Mr Lavrov said the opposition's demand for Mr Assad's removal was "wrong" and their refusal to talk to the Assad government a "dead end".
The now irreversible breach between Mr Erdogan and Syria's president, Bashar Assad, may have revived Mr Assad's friendship with the PKK. Growing discord between Iraq's Kurds in Erbil and the Shia-led central government in Baghdad is another worry.
Mr Erdogan's secular critics echo Mr Assad's claims that he is playing a sectarian card by propping up Islamists across the Middle East.
ECONOMIST: Turks fret about Syria, but few of them really want a fight
The plan quickly faltered when the U.S. and Russia could not agree on al-Assad's role, a detail left purposefully ambiguous.
Syria's neighbours, whose long silence reflected fears that Mr Assad's fall might cause more trouble than his survival, seem to have changed their minds.
Iran is Syria's strongest ally in the Middle East, and has provided Assad's government with military and political backing for years.
In neighboring Turkey on Sunday, Emine Erdogan, wife of Prime Minster Recep Tayyip Erdogan, spoke to the country's Saban newspaper about her counterpart in Syria, al-Assad's wife, Asma.
It's the latest in a series of grim assessments of al-Assad's chances from Russia, which has been Syria's leading arms supplier since the days of the Cold War.
CNN: Al-Assad's grip on power "slipping away," Medvedev says
All of Obama's calculations have now been challenged by what appears to be al-Assad's use of chemicals.
The 56-year-old, now a director at the University of Exeter's Strategy and Security Institute, believes the recruitment of members of President Assad's regime into the government which replaces it could be vital in avoiding the kind of insurgency activity which dogged Iraq after the 2003 conflict.
Russia has repeatedly blocked U.S. efforts to pass a United Nations Security Council resolution calling for Mr. Assad's ouster and tough economic sanctions.
Hence the opposition's charge this week that Mr Barak was cynically holding the army in south Lebanon hostage to Mr Assad's whims.
Mr Assad's exiled opponents may be scrappy, but those on the ground are making progress.
Mr Assad's opponents plan to meet on March 26th to try and heal rifts.
Mr Assad's government seems to believe that such tactics will succeed in stanching the revolt.
But in demanding al-Assad's ouster, Blair said, world powers must be careful about what comes next.
Medvedev said he blames both the opposition and al-Assad's government for refusing to negotiate.
CNN: Al-Assad's grip on power "slipping away," Medvedev says
Leaks from Washington suggest that the Obama administration may consider demanding Mr Assad's departure.
Mainly thanks to Mr Assad's intransigence, none of these conditions is being properly met.
Iran and Hezbollah are predominantly Shia, while Mr Assad's Alawite sect is an offshoot of Shia Islam.
Better to use Mr Assad's present weakness as an opportunity to change Syria's behaviour, not its regime.
While Mr Assad's attention focused ever more narrowly on the peace process, internal policy began to drift.
Saudi Arabia, Qatar and Turkey have backed the rebels, while Assad's main allies are Iran and Russia.
Assad's move is yet another clear sign that he has no intention of compromising with his opponents.
They say this explains Turkish support for Mr Assad's Sunni opponents and especially for the Muslim Brotherhood.
ECONOMIST: Turkish foreign policy: Problems with the neighbours | The
Mr. Keane and Ms. Pletka also fail to understand what Bashar al-Assad's reaction to an attack might be.
WSJ: Think Things Through Before Opening Fire in Syria �� Letters to the Editor
After the coldness between Mr Arafat and Mr Assad's father, Palestinians are seeing this as a genuine thaw.
In response to Mr Assad's comments, Mr Hague said the Syrian president was a man "presiding over this slaughter".
BBC: Hague: Giving arms to Syrian rebels cannot be ruled out
Assad's major allies, the Lebanese militant Hezbollah group and Iran, are both Shiite.
Mr Assad's exiled foes remain divided, unable to channel a significant flow of arms or aid into the country.
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