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Russia has called for emergency consultations on Syria in the UN Security Council, Russian news agency RIA reports citing a diplomatic source.
Russia's Foreign Minister Sergei Lavrov has reportedly told his French counterpart that any proposal for a UN resolution holding Syria responsible for a chemical weapons attack would be "unacceptable".
Separately, Russia's foreign ministry said it will propose a UN draft declaration supporting an initiative to bring Syria's chemical weapons stockpile under international control.
France's Foreign Minister Laurent Fabius has said that Russia is not keen on a binding resolution on Syria in the UN Security Council.
His comments came after he spoke to his Russian counterpart Sergei Lavrov.
The Prime Minister has said that a UN resolution laying out a timetable for the destruction of Syria's chemical weapons stockpile would "test" Russia's resolve to follow through.
Mr Cameron told a panel of senior MPs at the House of Commons Liaison Committee: "If we can achieve the removal and the destruction of the biggest chemical weapons arsenal in the world, that would be a significant step forward".
But he voiced his earlier concerns that the proposal could be a "delaying tactic" and that any plan for disarmament must include a timetable and "consequences" if this was not kept to.
An official at the White House has told NBC News that talks over Russia's proposal to lock down Syria's chemical weapons are due to begin at the United Nations later today:
Britain, France and the US are to table a resolution in the UN Security Council regarding Syria's chemical weapons later today, the Prime Minister has said.
The announcement follows talks between the leaders of the three countries today.
Mr Cameron added that Russia's proposal for Syria to hand over its chemical weapons needed to be tested, as well as being subject to a deadline.
US President Barack Obama is still seeking approval from Congress for a possible military strike in Syria despite the possibility of reaching a diplomatic deal, according to State Secretary John Kerry.
US Defence Secretary Chuck Hagel has said that for a diplomatic solution in Syria to have any chance of succeeding, there is still a need for a "real threat" of US military action.
The Prime Minister has tweeted that he has spoken to US President Barack Obama about developments in Syria.
The United States is waiting to see a real and verifiable plan from Russia for removing chemical weapons from Syria but will not wait long, Secretary of State John Kerry has warned.
"We're waiting for that proposal. But we're not waiting for long," Kerry told a hearing of the House of Representatives Armed Services Committee.
"President Obama will take a hard look at it. But it has to be swift, it has to be real, it has to be verifiable. It cannot be a delaying tactic," Kerry told the panel.
Latest ITV News reports
As President Barack Obama confirms the US will not launch strikes in Syria it is a case of everybody wins ... except for the victims.