It said in a statement that "terrorist groups", a term the Syrian government uses to refer to all insurgents fighting against it, had failed to commit to any of the provisions of the deal, and had used the ceasefire to rearm whilst violating it 300 times.
Each side has accused the other of violating the truce, which appears to be in tatters, a week after taking effect.
Kerry says Syrian ceasefire holding but fragile
The Syrian ceasefire is holding but fragile, US Secretary of State John Kerry said on Monday amid reports that fighting had picked up after a week of reduced violence and humanitarian aid was still not getting to besieged areas in Aleppo.
"The basic ceasefire is holding but (is) fragile," Kerry said as he met his Vatican counterpart in New York. "We're waiting to get the full download from our team that is meeting now with the Russians in Geneva."
He said humanitarian assistance should reach eight locations on Monday, a key part of the ceasefire negotiated between him and Russian Foreign Minister Sergei Lavrov more than a week ago.
Russia says it's "senseless" for Syrian army to respect ceasefire unilaterally
Russia's Defense Ministry said on Monday it considers it "senseless" for Syrian government forces to respect a ceasefire unilaterally when it is being attacked by militants who cannot be reined in by the United States.
"Syrian servicemen and peaceful citizens are still dying. The cause of this is the fact the United States has no effective leverage to influence Syria's opposition and is unaware of the real situation on the ground," Lieutenant-General Sergei Rudskoi, a senior Russian Defense Ministry official, told a briefing.
"Taking into account the fact that the terms of the ceasefire are not respected by militants, we consider observing it unilaterally by Syrian government forces is senseless."
The ministry said its monitors on the ground had registered 53 ceasefire violations in Syria over the past 24 hours. There is information that moderate Syrian opposition units are merging with "terrorist groups" and preparing joint attacks, the ministry said.
Syria ceasefire is fragile but only hope to end conflict-France
A U.S.-Russian ceasefire agreement for Syria is particularly fragile but it remains the only hope to resolve the conflict, French Foreign Minister Jean-Marc Ayrault said on Monday.
"The Russian-American accord is particularly fragile, but this must remain a glimmer of hope. It is the only basis on which the international community can (proceed)," Ayrault told reporters, adding he wanted Washington and Moscow to include the rest of the Syria support group into the ceasefire plan so that they could create a mechanism to monitor ceasefire violations.
"The Libya situation is worrying and worsening. The offensive by Haftar is not taking us in the right direction. There is a real chance that we are going backwards in Libya," Ayrault added, referring to an offensive by forces loyal to eastern commander Khalifa Haftar's Libyan National Army (LNA).