Veteran Russian opposition activist Sergei Davidis was among 300 people who showed up to a protest in Moscow against the start of the Kremlin's Syria bombing campaign. 

Life in Aleppo will become impossible within weeks under relentless Russian and Syrian regime air strikes, the head of the renowned White Helmets volunteer rescue force said Tuesday.

NATO head Jens Stoltenberg said Tuesday the "morally totally unacceptable" bombardment of the Syrian city of Aleppo broke international law, and urged Russia to take genuine steps to restore a ceasefire.

Moscow on Monday slammed the United States and Britain for accusing Russia of "barbarism" and war crimes in Syria as Russian and Syrian warplanes continued to bomb rebel-held areas of Aleppo.

The U.N. Security Council met for urgent talks on Sunday as Syrian and Russian warplanes  pounded rebel-held east Aleppo in the worst surge of bombing to hit the devastated city in years.

Britain, France and the United States called the emergency meeting to turn up pressure on Russia and press demands that it rein in its ally Syria to halt the intense bombing campaign on Aleppo.

More than 120 rebels and dozens of their relatives on Thursday left the last rebel-held district of Syria's Homs city under a deal with the regime, the governor said. 

The White Helmets, a Syrian civil organization of emergency responders in rebel-held areas, on Thursday won the Right Livelihood Award, the jury for the Swedish human rights prize announced.

Russia's defense minister said Wednesday that Moscow was dispatching its flagship aircraft carrier to bolster its forces in the eastern Mediterranean off Syria. 

U.S. Secretary of State John Kerry demanded on Wednesday that Russia force Bashar Assad's regime to ground its air force in order to revive hopes of a ceasefire in Syria's civil war.

Addressing the U.N. Security Council, including his Russian opposite number Foreign Minister Sergei Lavrov, Kerry said efforts to find peace could yet be salvaged but only if Moscow takes responsibility for recent air strikes.

Intense air raids shook Syria's Aleppo and killed a team of medics as the U.N. Security Council held crisis talks Wednesday on reviving a failed ceasefire.