Two dozen countries agreed Tuesday to push for sanctions against perpetrators of chemical attacks in Syria, with U.S. Secretary of State Rex Tillerson saying Russia "ultimately bears responsibility" for such strikes.

Twenty-four nations approved a new "partnership against impunity" for the use of chemical weapons, just a day after reports they were used in an attack that sickened 21 people in rebel-held Eastern Ghouta, which Tillerson said was suspected to involve chlorine.

At Tuesday's meeting, 24 out of 29 countries attending committed to sharing information and compiling a list of individuals implicated in the use of chemical weapons in Syria and beyond.

have been at least 130 separate chemical weapons attacks in Syria since 2012, according to French estimates, with Daesh (ISIS) also accused of using mustard gas in Syria and Iraq.

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