President Tayyip Erdogan of Turkey, which hosts 3 million Syrian refugees, said he had reiterated to Obama and Putin at the G-20 talks in China the need for a "no-fly zone" over Syria and a "safe zone" where there would be no fighting, in hopes of stemming the human migration.
And given the frosty faces of Presidents Vladimir Putin and Barack Obama in photographs of them meeting at the G20 summit in China, it seems little surprise that they were unable to reach a deal on ending the violence in Syria.
Obama described the talk with Putin as "candid, blunt and businesslike".
More than 250,000 people have been killed since the conflict erupted in 2011, when government forces launched a violent crackdown against pro-democracy protesters calling for President Bashar al-Assad to step down.
Deep divides over Syria have marred Obama's relationship with Putin, adding to a litany of discord between the United States and Russian Federation that's driven relations to their lowest level since the Cold War.
Turkey has also staged a major incursion inside Syria to back the opposition fighters which it says is aimed at rooting out both Islamic State (IS) jihadists and Kurdish militia on its border.
"Given the gaps of trust that exist, that's a tough negotiation", Obama said at a news conference closing the Group of 20 summit.
Moscow has sometimes questioned whether US -backed rebels really are moderate.
Multiple bomb blasts in different Syrian cities
At one point, FSA fighters clashed with YPG/SDF forces near Manbij. The Observatory confirmed a bomb but had no casualty figures.
And she doesn't know if the USA even wants to fix the relationship, because she believes Russian Federation is a convenient punching bag.
President Barack ObamaBarack ObamaTrump refuses to say whether Obama born in U.S.
However, there have been signs of a rapprochement on Syria between the two countries after a deal to normalise crisis-hit relations, with Ankara acknowledging Assad could temporarily stay on in a transition. U.S. officials blame Russian intelligence for a hack on the Democratic National Committee that resulted in a leak of emails damaging to its presidential nominee, Hillary Clinton.
"Many of the groups considered acceptable by the U.S, have actually affiliated with the Nusra Front, while the Nusra Front is using them to avoid being attacked", Ryabkov told Russian media, citing a longstanding complaint of his government.
Negotiators failed to work through differences, and the talks have ended for now.
But the US has always been wary on the military coordination part of the deal, because it says Russian Federation has mainly targeted moderate, USA -backed opposition groups in a bid to prop up Assad.
Absent any detail from Obama on the new world cyber order he's imagined, it looks like there are loopholes a-plenty allowing online operations to carry on even while pacts apply.