Site of regime bombing in Aleppo
Site of regime bombing in AleppoReuters

The United States and Britain warned on Sunday that Western allies were considering imposing sanctions against economic targets in Syria and Russia over the siege of Aleppo, AFP reported.

U.S. Secretary of State John Kerry branded the bombardment of civilians in the Syrian battleground city as "crimes against humanity" and British Foreign Secretary Boris Johnson urged Moscow to show mercy.

"There are a lot of measures that we're proposing including extra measures on the regime and their supporters," Johnson said, standing alongside Kerry after talks in London.

"These things will eventually come to bite the perpetrators of these crimes, and they should think about it now," he warned.

The Syrian army announced an all-out offensive against the rebel-controlled section of Aleppo on September 22, shortly after a ceasefire brokered by the United States and Russia fell apart.

On Tuesday, at least 12 civilians were killed in the heaviest Russian bombardment in days of Aleppo. Russia supports Syrian President Bashar Al-Assad in the war against rebels.

Kerry on Sunday warned that President Barack Obama had not taken any option off the table in terms of tackling Assad's assault on his own people.

He too raised the idea of sanctions but he played down the possibility of military action and insisted that it was his and Johnson's duty to "exhaust" all diplomatic options.

"We are discussing every mechanism available to us but I haven't seen a big appetite from anyone in Europe to go to war," Kerry said after talks with French and German officials.

"I don't see the parliaments of European countries ready to declare war," he said.

"Let me make it clear," added Kerry. "We are considering additional sanctions and... President Obama has not taken any option off the table."

French Foreign Minister Jean-Marc Ayrault said stopping the bombardment of Aleppo took precedence during the talks.

"We see that the regime along with Russian support has other objectives," he said following the meeting.

"We are always ready to speak with the Russians and with the Iranians but we demand that the precondition is stopping the bombardment."

AFP contributed to this report.

(Arutz Sheva’s North American desk is keeping you updated until the start of Sukkot in New York. The time posted automatically on all Arutz Sheva articles, however, is Israeli time.)