The United States is consulting with Britain and France about a joint military response to the attack in Douma that medics and rescuers said left at least 40 people dead on Saturday. But Nebenzia said the goal was to oust President Bashar al-Assad from power.
"The sole thing that they have an interest in is to oust the Syrian government and to deter, contain the Russian Federation," he added.
"You don't rush decisions like this," Haley told reporters, adding that if there is haste "you make a mistake." Russia's envoy Nebenzia called on the United States, France and Britain "not to bring the world to such a dangerous threshold."
The warning from Moscow came as UN Secretary-General Antonio Guterres warned that increasing tensions over Syria could lead to "full-blown military escalation.
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