Moscow has accused Washington of sabotaging the Syria ceasefire deal, saying that the US will be responsible for any new terror attacks in Syria, as by taking no action against Al-Nusra terrorists it shows it is ready “to make a deal with the devil.”

Washington “has never exerted any real pressure on Jabhat Al-Nusra, done nothing for delineation to succeed and taken no action against its militants,” the Russian Foreign Ministry said in a statement Monday, following the US decision to suspend cooperation on Syria.

Besides failing to deliver on its part of the deal, the US were hampering Moscow’s efforts to stop the terrorists, the Russian Foreign Ministry said, calling Washington’s decision a “reflection” of the Obama administration’s inability to meet the key condition for Russia-US cooperation on the Syrian peace process.

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The way the situation has been unraveling in Syria in the past few weeks has made Moscow doubt what Washington’s real intentions are, according to the ministry.

“We are becoming more convinced that in a pursuit of a much desired regime change in Damascus, Washington is ready to ‘make a deal with the devil’,” the Foreign Ministry said. For the sake of ousting Syrian President Bashar Assad, the US appears to be ready to “forge an alliance with hardened terrorists, dreaming of turning back the course of history.”

While Jabhat Al-Nusra, a designated terrorist organization, has been known as an Al-Qaeda affiliate for many years, Washington “is not in a hurry to separate US-oriented anti-government forces from it,” Moscow points out. On the contrary, even though Al-Nusra has never been a part of any peace deal, Washington “covers it with the shield of opposition groups which formally confirmed their participation in the cessation of hostilities.”

Meanwhile, Russia's Permanent Representative to the UN, Vitaly Churkin, who on Monday assumed the post of the President of the UN Security Council, expressed his concerns over the halt in Russia-US cooperation in Syria.

At the same time, he insisted that the current setback in Syria will not lead to another “Cold War” between Moscow and Washington.

“I think you are dramatizing the nature of our disagreements with the US,” Churkin said, replying to a reporter at a press conference, adding that there’s still a chance to revive the cooperation.

“I hope there will not be a new Cold War,” he added.

For now, the main objective in Syria for Russia is to thwart Al-Nusra’s latest offensive in Aleppo, which has seen increasing number of terrorist attacks in the wake of the ceasefire’s collapse.

"In the process of the past few weeks, after the September 9 arrangements were reached, we have seen numerous violations by Nusra and others cooperating with Nusra of the cessation of hostilities regime”, Churkin said, adding that about 1.5 million people are currently stand the risk of being besieged by its militants south of Aleppo.

“We must make sure that Nusra’s influence is not going to continue to spread,” he stressed, describing the situation in Aleppo as “extremely dramatic.”

On a broader scale, Russia’s long-term aim in the region is to “throw the terrorists out” of Iraq and Syria, as it is the only way to secure the lives of civilians, living there in constant danger from extremists.

To mitigate the impact of one of the terrorists’ most powerful weapons, propaganda, Russia has submitted a draft resolution to the UN Security Council designed “to counter terrorist ideology and the ideology of violent extremism,” Churkin said.

Meanwhile, U.S. Assistant Secretary of State for European and Eurasian Affairs Victoria Nuland is set to visit Moscow this week. However, she is expected to discuss solely Ukraine and implementation of the Minsk agreements, according to the State Department’s press release.