Prime Minister Vladimir Putin, facing an outburst of protest against his rule, called Monday for an update of Russia's political system in response to what he said was a maturing civil society.

"We need to create a political system where people can and must speak the truth," Putin said in a wordy article which also quoted Soviet dissident writer Alexander Solzhenitsyn.

The movement against Vladimir Putin was Sunday preparing new rallies to loosen the Russian strongman's 12-year grip on power after keeping up their challenge with a third mass demonstration in Moscow.

Tens of thousands marched through Moscow Saturday despite bitterly cold weather to protest against Putin's domination, with organizers disputing police claims that a pro-Putin rally elsewhere in the capital was even larger.

Crowds of Syrians chanting anti-Russian slogans entered Moscow's embassy in Tripoli on Sunday and hoisted the new Syrian flag on the building, an Agence France Presse journalist and a Syrian activist said.

The journalist said about 200 Syrians entered the embassy and first removed the Russian flag.

Jordanian Islamists on Sunday called on Muslims and Arabs to boycott Russian and Chinese products after the two countries vetoed a U.N. Security Council resolution condemning Syria's regime over bloodshed.

"By vetoing the resolution, Russia and China have shown that they are taking part in the killing of Syrian people," Hammam Saeed, the leader of the powerful Muslim Brotherhood, said on the group's website.

Russian Foreign Minister Sergei Lavrov will ask President Bashar Assad for rapid reforms on a visit to Syria this week, his ministry said Sunday, as Moscow hit back at Western outrage over its U.N. veto.

Lavrov's visit to Damascus on Tuesday alongside the head of Russia's Foreign Intelligence Service (SVR) will aim to stabilize the situation in Syria by winning the implementation of "rapid" reforms, the foreign ministry said.

Two demonstrations were held on Sunday in front of the Russian Embassy in Beirut over Russia’s position on Syria at the United Nations Security Council, reported the National News Agency.

One demonstration, comprised of Syrian nationals, advocated the European state, while the other, organized by the Jamaa Islamiya, condemned it.

Russia on Sunday blamed Western powers for the U.N. Security Council's failure to pass a resolution condemning the violence in Syria, saying they had failed to make an additional effort for a consensus.

"The authors of the draft Syria resolution, unfortunately, did not want to undertake an extra effort and come to a consensus," Deputy Foreign Minister Gennady Gatilov wrote on Twitter after Russia and China's use of their veto sparked outrage. "The result is known," he added.

An official Syrian newspaper on Sunday hailed the Russian and Chinese double veto of a draft U.N. Security Council resolution on the regime's crackdown, calling it a catalyst for the speeding up of reform.

The daily government mouthpiece Tishreen was the only Syrian paper to comment on the veto, which drew swift condemnation from world powers.

Tunisian Prime Minister Hamadi Jebali called Sunday on all countries to cut off diplomatic relations with Syria over the violence there.

"We have to expel Syrian ambassadors from Arab and other countries," Jebali said during a panel discussion on the Middle East at a security conference in the southern German city of Munich.

The opposition Syrian National Council on Sunday slammed the Russian and Chinese veto of a U.N. Security Council resolution on Syria as giving the regime of President Bashar Assad a "license to kill."

The SNC said in a statement "Syrians and others around the world" had looked to the Security Council to issue a strongly worded resolution, "one that would clearly condemn the Syrian regime's crimes; the atrocity and impunity with which it kills civilians, including women and children; and the genocide it commits in exterminating entire families.