The request came after Russia vetoed a US-drafted resolution that would have extended for a year the Joint Investigative Mechanism (JIM) and a second Russian-proposed measure failed to win enough votes at the Security Council.
Japan's proposed measure would allow more time to negotiate a possible compromise to allow the panel to continue its work of identifying those responsible for toxic gas attacks in Syria.
The draft measure would renew the JIM mandate for 30 days and task UN Secretary-General Antonio Guterres with submitting to the council in 20 days "proposals for the structure and methodology" of the panel.
Russia earlier cast its 10th veto on Syria at the top UN body, blocking the one-year extension of the JIM as proposed in a US-drafted resolution that won 11 votes.
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A Russian-drafted resolution fell short of the nine votes required for adoption, garnering just four votes in favour.
Russia has sharply criticised the JIM after its latest report blamed the Syrian air force for a sarin gas attack on the opposition-held village of Khan Sheikhun that left scores dead.
Syria has denied using chemical weapons, with strong backing from Russia.
The joint UN-Organisation for the Prohibition of Chemical Weapons (OPCW) panel was set up by Russia and the United States in 2015 and unanimously endorsed by the council, which renewed its mandate last year.
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