The two sides seemed to be talking past each other.
The diplomatic dance around the Syrian National Coalition tour just confirmed that President Bashar al-Assad and his rebel opponents are nowhere near ready to thrash out a peace deal, according to diplomats and experts.
New coalition leader Ahmad Jarba met with French President Francois Hollande, US Secretary of State John Kerry and the divided UN Security Council in a week in which the war stakes grew horrifyingly worse.
Jarba and rebel military chief General Selim Idriss called on the French president to supply arms. Jarba made the same demand to Kerry in New York, and called on the Security Council to increase "pressure" on Assad.
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"Until the regime has been forced to accept a political solution, we must have the means to protect ourselves and defend civilians," Jarba said after the New York meeting. A refusal would mean thousands more would be "executed."
Both said there can be "no military solution" to the conflict where the death toll has overtaken the 1992-95 Bosnia war, and the refugee flood is closing to beating the exodus from the Rwanda genocide in 1994.
But the United States, France and Britain are all considering arming the rebels, while the UN's Syria peace envoy Lakhdar Brahim admitted this week that "it is extremely difficult to bring together those who have been killing each other for two years."
"Overtly we do not provide lethal assistance," said Tabler. "But covertly we do and that is currently being considered."
"We are going through the motions on the Geneva stuff because officially our policy is to support Geneva, but nobody thinks that it will work any time soon," he said.