US Secretary of State John Kerry traveled to Moscow this week to assure Syrian President Bashar al-Assad's key ally that Washington is not seeking "regime change" in Syria.
And yesterday, the top US diplomat met Saudi Foreign Minister Adel al-Jubeir to reassure Assad's most implacable foe that the United States is not going soft on the Syrian strongman.
Kerry's high-stakes diplomatic balancing act aims to keep both Moscow and Riyadh on board as the 17-nation International Syrian Support Group (ISSG) struggles to cobble together peace talks.
Washington and UN Syrian envoy Staffan de Mistura want Assad's regime and the armed groups ranged against him to send delegates to peace talks some time on or after January 1.
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If a ceasefire can be reached in Syria's four-and-a-half-year-old civil war, then Syrian troops, Russia and a US-led coalition can focus their fire on the hardline jihadist Islamic State group.
But several questions still hang over the process.
Will Assad and his foreign backers Russia and Iran agree to sit down with rebel groups they routinely denounce as "terrorists"?
And, will the rebels and their foreign backers countenance talks with a regime that has slaughtered thousands of its own citizens with barrel bombs and poison gas?
Today, international envoys - including in particular Russia's Foreign Minister Sergei Lavrov - want to hear from Saudi Arabia how its efforts to mediate a rebel coalition are progressing.
Even if a ceasefire is possible, who would monitor it? And who would lead the fight against the IS group and others, such as Al-Qaeda's Al-Nusra Front, left outside the peace process?
To address these and other questions, the International Syrian Support Group will meet at US invitation today morning at a New York hotel to try to narrow their disagreements.