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US Secretary of State John Kerry speaks with Russian Foreign Minister Sergei Lavrov during the International Syria Support Group meeting at the Palace Hotel in Manhattan, New York, September 22, 2016. Image Credit: Reuters

Washington: US Secretary of State John Kerry is threatening to cut off all contacts with Moscow over Syria, unless Russian and Syrian government attacks on Aleppo end.

The State Department says Kerry issued the ultimatum in a Wednesday telephone call to Russian Foreign Minister Sergey Lavrov.

Kerry’s spokesman, John Kirby, says Kerry expressed grave concern over Russian and Syrian government attacks on hospitals, water supplies and other civilian infrastructure in Aleppo.

He says Kerry told Lavrov the US holds Russia responsible for the use of incendiary and bunker-buster bombs in an urban area.

Kerry told Lavrov the US was preparing to “suspend US-Russia bilateral engagement on Syria,” including on a proposed counterterrorism partnership, “unless Russia takes immediate steps to end the assault on Aleppo” and restore a cease-fire.