US Secretary of State Hillary Clinton said late on Wednesday that it is time for Russia and the United Nations Security Council to speak with a "unified voice" on Syria.

"We have repeatedly urged the Russian Government to cut these military ties completely and to suspend all further support and deliveries. Obviously, we know, because they confirm that they continue to deliver", said Clinton in remarks after meeting with Indian Foreign Minister Somanahalli Mallaiah Krishna.

"We believe that the situation is spiraling towards civil war, and it is now time for everyone in the international community, including Russia and all Security Council members, to speak to Assad with a unified voice and insist that the violence stop, and come together with (United Nations and Arab League envoy) Kofi Annan to plan a political transition going forward", she added.

Clinton noted that "it is something that we believe is in everyone's interests, most particularly the Syrian people. And Russia says it wants peace and stability restored. It says it has no particular love lost for Assad. And it also claims to have vital interests in the region and relationships that it wants to continue to keep. They put all of that at risk if they do not move more constructively right now".

"I would emphasize that the United States has provided no military support to the Syrian opposition, none. All of our support has been medical and humanitarian to help relieve the suffering of the Syrian people, a total of USD 52 million so far. We have also provided nonlethal support to the opposition, including things like communications gear", she added.

Clinton was replying to Russian Foreign Minister Sergei Lavrov's comments accusing the US of providing weapons to Syrian rebels.

She urged her Russian counterpart to "follow the lead and request of Kofi Annan and come together to try to implement the pillars of his plan, including a framework for a political transition. And that is what we have been advocating for and that is what I stand ready to do".

"It is clear that the voices of the entire international community need to be clear in the message to Assad, that it is time for him to participate in saving his own country from a downward spiral into even greater violence", concluded Clinton.