MOSCOW: Russia said on Wednesday it was "open to constructive proposals" on Syria but remained opposed to any UN resolution requiring all nations to abide by unilateral sanctions imposed by the West.

"We are open to constructive proposals that go in line with the set task of ending violence," Foreign Minister Sergei lavrov said following talks with his Turkish counterpart Ahmet Davutoglu.

His comments came as Russian and US officials had talks in Moscow on how to stop the violence in Syria, which UN estimates say have killed more than 5,400 people.

Russia was open to changes to a resolution it has proposed to the UN Security Council that blames both the Syrian government and the opposition for the use of force, said lavrov.

But he insisted that Russia would not back UN action granting the global body's approval of economic sanctions already adopted against its traditional ally by the European Union and the United States.

"We will not be able to back proposals under which unilaterally imposed sanctions against Syria -- sanctions that were declared without any consultations with Russia or China or other BRIC nations -- are blessed retroactively," said lavrov.

"This is simply unfair and counterproductive."

Any resolution backed by Russia "must firmly record that it cannot be used or interpreted to justify anyone's outside military intervention in the Syria crisis," he added.