Chinese Foreign Minister Wang Yi said the arms embargo should be lifted Oct. 18.
He also referred to the "snapback" provision, saying that since the US is no longer a party to the nuclear deal it has no right to demand the Security Council to activate the rapid reinstatement of sanctions mechanism.
The vote on the US-drafted resolution, which could come as early as Monday, and its expected defeat will set the stage for a potential crisis at the Security Council amid rising tensions in the Middle East and the US determination to maintain the UN arms embargo.
The five remaining parties to the 2015 nuclear deal Russia, China, Britain, France and Germany are determined to maintain it, and are very concerned that extending the arms embargo would lead to Iran's exit from the agreement and its speeded-up pursuit of nuclear weapons.