Shortly after Syria's armed forces declared that the truce was dead and blamed opposition rebels for undermining it, Kerry noted that the cease-fire had not produced the desired reduction in violence and sustained delivery of humanitarian aid. But he said some aid was finally moving.
"We have not had seven days of calm and of delivery of humanitarian goods," Kerry told reporters on the sidelines of the UN General Assembly.
He denounced the Syrian military declaration, but also suggested that Russia was partly to blame.
"It would be good if they didn't talk first to the press but if they talked to the people who are actually negotiating this," he said.
"As I said yesterday, (it's) time to end the grandstanding and time to do the real work of delivering on the humanitarian goods that are necessary for access."
Before that announcement, Kerry had said the truce was "holding but fragile."
He said US and Russian officials were meeting in Geneva to try to sort out aid deliveries to Aleppo and other besieged communities. American officials said, however, that conditions were still not right for US-Russian military cooperation.
The truce took effect last Monday.
The United States, Russia, the Syrian government and the Syrian opposition have all traded allegations of truce violations.
The figure does not include dozens of Syrian soldiers and Islamic State militants killed in the eastern province of Deir el-Zour, the Observatory said today.
A mistaken air raid by the US-led coalition also killed 62 Syrian soldiers.
The opposition reported 254 violations by government forces and their allies since the truce started on September 12 and a senior Syrian opposition official declared the cease-fire "clinically dead."
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