U.S. President Barack Obama (L) talks with Russia's President Vladimir Putin during arrivals for the G20 summit at the Konstantin Palace in St. Petersburg, September 5, 2013. REUTERS//Pablo Martinez Monsivais
Jonathan Marcus, BBC: Russia and the West: Where did it all go wrong?
It is hard to imagine a period since the end of the Cold War when relations between Russia and the United States have been quite so bad.
US officials have described the joint Russian-Syrian onslaught against Aleppo as "barbarism" and warned that war crimes are being carried out.
The Russian president has spoken explicitly about the worsening climate between Washington and Moscow, insisting that what the Obama administration wants is "diktat" rather than dialogue.
For all that, the US and Russia are still in contact over Syria. For all the harsh rhetoric and accusations, they both realise that they have a vital role to play in any eventual settlement of the Syrian drama.
Whatever its immediate strategic intentions, a permanent war in Syria doesn't benefit Moscow any more than Washington.
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WNU Editor: Ukraine. Sanctions. Arms buildup. Missile defense. Syria. The list is long on why relations have deteriorated .... starting with the Russian - Georgian war in 2008, and accelerating after the Ukraine revolution and war. What also does not help is that both men do not have a personal relationship .... they talk to each other on issues that impact both of their governments .... but that is where their relationship ends.