Syrian opposition activists say government forces with tanks and helicopters have massacred more than 150 people, mostly civilians, in a village in Hama province.
The activists and witnesses say troops shelled the village of Treimsa Thursday before storming the area. A rebel leader put the death toll at more than 200.
State-run Syrian media say troops battled an armed group in the area and, as in previous mass killings, blamed the massacre on those it calls terrorists.
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Russia is threatening to veto the Western-backed resolution. It wants to simply extend the mandate of the U.N. observer mission in Syria for another three months.
US warns against chemical weapon use
Meanwhile, the United States says the international community will hold Syrian officials accountable if they fail to meet their duty to safeguard the country's stockpiles of chemical weapons.
State Department spokeswoman Victoria Nuland says the U.S. has repeatedly warned Syria it is obligated to protect those weapons.
Nuland made her comments after a prominent U.S. newspaper reported that Syria has started moving part of its chemical weapons arsenal out of storage facilities.
The Wall Street Journal quoted U.S. officials as saying Syria may use the weapons against rebels or civilians.
Syria is believed to have reserves of sarin nerve agent, mustard gas and cyanide.
