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A draft UN resolution obtained Tuesday by The Associated Press would impose sanctions on 11 Syrians and 10 Syrian organisations and companies allegedly involved in chemical weapons attacks in the war-ravaged country.

The proposed Security Council resolution - drafted by the UK and France - would also ban all countries from supplying Syria's government with helicopters, which investigators have determined were used in chemical attacks.

The resolution follows a joint investigation by the United Nations and the international chemical weapons watchdog that determined the Syrian regime was behind at least three attacks involving chlorine gas and the Islamic State group was responsible for at least one involving mustard gas.

The US, UK and France have been pressing the council to impose sanctions on the Syrian regime for using chemical weapons. Previous council resolutions call for "measures" under Chapter 7 of the UN Charter, which authorises sanctions, if chemical weapons are used.

Russian support

But Russia, Syria's closest ally, has repeatedly questioned the conclusions linking chemical weapons use to the regime of President Bashar Assad reached by the Organisation for the Prohibition of Chemical Weapons-United Nations Joint Investigative Mechanism, known as the JIM.

Damascus denies using chemical weapons in the civil war, now in its sixth year. A Russian veto of the resolution is therefore highly likely when it is put to a vote, which diplomats say could be before the end of the year.

In addition to sanctions, the draft resolution would express the Security Council's "strong conviction that those individuals responsible for the use of chemical weapons in the Syrian Arab Republic should be thoroughly investigated, and prosecuted, as appropriate, before a competent tribunal which is both independent and impartial".

Blame

The 11 Syrians who would be subject to an asset freeze and travel ban under the draft resolution include Amr Armanzi, director-general of Syria's Scientific Studies Research Center, which is responsible for the development and production of chemical weapons and the missiles to deliver them in the country.

A Russian veto of the resolution is therefore highly likely when it is put to a vote.

Nine current and former military officers and the managing director of a ministry of defence subsidiary that assists in the production of chemical weapons are also named.

The 10 "entities" that would be put on the sanctions blacklist and subject to an asset freeze under the draft resolution include the Scientific Studies Research Center and several government subsidiaries, proxies, front companies and factories allegedly involved in producing chemical weapons.

A chemical weapon attack on a Damascus suburb that killed hundreds of civilians on 21 August 2013, led to a US-Russian agreement and a Security Council resolution the following month that ordered the destruction of Syria's chemical weapons, precursors and the equipment to produce the deadly agents.

The Syrian regime's support for the resolution and decision to join the chemical weapons watchdog known as the OPCW warded off possible US military strikes in response to the attack, which Damascus denied carrying out.

Syria's declared stockpile of 1,300 metric tons of chemicals has been destroyed, but the OPCW is still investigating outstanding questions about possible undeclared chemical weapons.

The draft resolution expresses "grave concern" that the OPCW "is not able to resolve all identified gaps, inconsistencies and discrepancies in Syria's declaration" and orders Syria to give a full declaration within 30 days of its adoption.