Russia has accused the west of using blackmail to secure a new UN Security Council resolution that would authorise the use of force in Syria.
Russian foreign minister Sergey Lavrov said threats to discontinue the 300-strong UN unarmed observer mission to Syria if Russia does not agree to allow the west to use force in the country amounts to blackmail.
The UN authorised the 90-day mission to oversee the cessation of violence and monitor implementation of the UN peace plan.
The team, whose mandate expires on July 20, had to withdraw from key conflict areas because of escalating violence.
Russia said last week it will oppose any new UN resolution on Syria that would include the use of force.