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In this file photo, the wife of Mohammad Halak mourns his death due to injuries caused by gun fire during heavy fighting between the Syrian rebels and Syrian Army forces in Idlib north Syria. Image Credit: AP

Moscow: Russia on Wednesday said it was defending "fairness" rather than Syrian President Bashar Al Assad's regime in vetoing two UN Security Council draft resolutions on the crisis.

"We are not defending the regime but fairness, the sovereign right of the Syrian people themselves to have a democratic choice," Interfax quoted Foreign Minister Sergei Lavrov as telling a parliamentary hearing.

Meanwhile, the Syrian army has seized full control of Idlib following a four-day assault and rebel troops have fled, an activist in the northwest city said.

"Since last night there has been no more fighting," said Noureddin Al Abdo, reached by telephone from Beirut.

"The (rebel) Free Syrian Army (FSA) has withdrawn and regime forces have stormed the entire city and are carrying out house-to-house searches."

The army launched its assault on the rebellious province near the Turkish border on Saturday, bombarding the city and outlying regions in a bid to root out armed insurgents.

"The FSA preferred to withdraw because everyone knows it cannot resist the army," Abdo said.

A pro-government newspaper on Tuesday had announced the fall of the city, saying regime forces had managed to capture it in record time.

"A major operation launched three days ago in Idlib... ended in record time with army units wrapping up search operations during which dozens of armed men and fugitives were killed," Al Watan daily said.

The capture of Idlib comes two weeks after regime forces stormed the Baba Amr rebel stronghold in central Homs following a month-long blitz that left hundreds dead.