Turkish Foreign Minister Ahmet Davutoglu

REUTERS

Syria's army pounded the rebel city of Homs on Wednesday as Turkey sought international action to protect civilians from former ally President Bashar al-Assad, a move that risks the wrath of Russia and China.

Dozens more were killed during the day, according to the opposition, drawing comparison with the plight of Benghazi which triggered Western attacks on Libya last year and accelerating a global diplomatic showdown whose outcome is far from clear, reports Reuters.

"I've seen whole families killed this week," an activist called Ahmed told Reuters from Homs, the scene of one of the bloodiest government onslaughts in the 11-month-old revolt against Assad. "Now I feel like I'm just waiting to be the next to die," added the accountant aged 28.

Turkish Foreign Minister Ahmet Davutoglu told Reuters before flying to Washington for talks on Syria that Turkey, which once saw Assad as a valuable ally but now wants him out, could no longer stand and watch and wanted to host an international meeting to agree ways to end the killing and provide aid.

"It is not enough being an observer," he said. "It is time now to send a strong message to the Syrian people that we are with them," he added, while refusing to be drawn on what kind of action Turkey or its allies would be prepared to consider.

Syrian army tanks and artillery pounded areas of Homs where revolt had flourished, demolishing buildings where people were living, short of water, food and medical supplies and pinned down by sharpshooters on rooftops.

Syrian state media blamed foreign-backed "terrorists" for killing 30 security personnel on Tuesday and causing an explosion that set a refinery ablaze.

"All the international community should work together to help," Davutoglu said. "Especially those who cannot even go from one street to another in Homs. You have pictures of children running from one house to another house while under artillery attack ... They cannot continue these methods of oppression."

Syria's position at the heart of the Middle East, allied to Iran and home to a powder-keg religious and ethnic mix, means Assad's opponents have strenuously ruled out the kind of military action they took against the isolated Libyan leader Muammar Gaddafi.

Some form of corridors for aid and evacuation, or ceasefire accords inside Syria, may be the most achievable demands.

Russia and China, which let the United Nations support the air campaign in Libya, provoked strong condemnation from the United States, European powers and other Arab governments when they vetoed a much less interventionist resolution in the Security Council last week that called on Assad to step down.

While Moscow sees him as a buyer of arms and host to a Soviet-era naval base, for both Russia and China Syria is also a test case for efforts to resist U.N. encroachment on sovereign governments' freedom to deal with rebels as they see fit.

Campaigning for next month's presidential election that he is certain to win, Prime Minister Vladimir Putin, who first won the presidency after storming the rebel Russian city of Grozny, said: "A cult of violence has been coming to the fore in international affairs ... This cannot fail to cause concern.

"We of course condemn all violence regardless of its source, but one cannot act like an elephant in a china shop.

"Help them, advise them, limit, for instance, their ability to use weapons but not interfere under any circumstances."

It is unclear what Turkey, a NATO member and rising Muslim, democratic force in the Middle East, could do to bring Moscow into any international initiative alongside those regional and world powers which have sided with the rebels against Assad.