After a meeting with Lakhdar Brahimi, theU.N.'s envoy for the Syrian crisis, Lavrov also said that the Syrian opposition risks sacrificing many more lives if it continues to insist on Assad leaving office as a precondition for holding talks on Syria's future.

Assad "has repeatedly said publicly and privately, including in his meeting with Lakhdar Brahimi in Damascus not long ago, that he does not intend to leave for anywhere, that he will stay to the end in his post, that he will, as he expressed it, defend the Syrian people, Syrian sovereignty and so forth," Lavrov said. "There's no possibility to change this position."

Brahimi warned that the country's civil war could plunge the entire region into chaos by sending hundreds of thousands of refugees into neighboring nations, but his talks in Moscow produced no sign of progress toward settling the crisis.

Brahimi and Lavrov both said after their meeting that the 21-month-old Syrian conflict can only be settled through talks, while admitting that the parties in the conflict have shown no desire for compromise. Neither official hinted at a possible solution that would persuade the Syrian government and the opposition to agree to a ceasefire and sit down for talks about a political transition.

Brahimi, who arrived in Moscow on a one-day trip following his talks in Damascus with Assad this week, voiced concern about the escalation of the conflict, which he said is becoming "more and more sectarian."