The UN Security Council is struggling to agree a resolution seeking a ceasefire in Syria and has put back a vote until Saturday.
The vote has already been delayed several times since Thursday.
Russia wanted changes to a draft that calls for a 30-day calm to allow for aid deliveries and medical evacuations.
Western diplomats have accused Russia, Syria's key ally, of stalling for time. France said failure to act may spell the end of the UN itself.
Minds have been focused amid outrage at the plight of civilians in the Eastern Ghouta rebel enclave.
Activists say 462 people have now been killed there this week.
Warplanes maintained the bombardment on Friday, witnesses said. Douma and Hamouriyeh were among areas hit.
Western powers suspect that Moscow wants to give Syria time to deal a final blow to forces defending the rebel-held enclave on the edge of Damascus.
The United States, the UK and France had called for the resolution to be approved without delay. UN special envoy Staffan de Mistura said a truce had to be followed by immediate, unhindered access to the Eastern Ghouta.
Commenting on Friday evening, US President Donald Trump pointed the finger of blame firmly at Syria and its allies, Russia and Iran, for the humanitarian crisis.
"What those three countries have done to people over the last, short period of time is a disgrace," he said, speaking alongside the visiting Australian Prime Minister Malcolm Turnbull in Washington.
