"... and calling into question whether the deal would ever have worked. Waves upon waves of planes relentlessly struck neighborhoods in the rebel-held east of the city on the first day of a new offensive announced by the government.... Instead, the launch of the offensive called into question the entire premise of the agreement painstakingly negotiated by Kerry and [Russian Foreign Minister Sergei ] Lavrov over the past eight months: that Russia shares the Obama administration’s view that there is no military solution to the conflict. On that basis, U.S. officials have explained, Moscow would be willing to pursue a negotiated settlement in return for a cease-fire and the prestige of eventually conducting joint military operations in Syria alongside the United States against terrorist groups.... The attack puzzled many in Moscow who thought that Russia wanted the deal, said Vladimir Frolov, a foreign affairs columnist for the Moscow Times. But, he said, it now appears that Russia is 'leaning towards the view that this war is winnable. Realistic people realize that this is not possible, but some people are unrealistic,' he added...."
From "A ferocious assault on Aleppo suggests the U.S. may be wrong on Syria" in The Washington Post.