In a strongly-worded statement at a meeting of the watchdog Organisation for the Prohibition of Chemical Weapons (OPCW), US representative Ken Ward said Russia was "continuing to deny the truth" regarding the attack in which sarin gas was used.
Last month a report by a joint UN-OPCW panel said the Syrian air force on April 4 had dropped a bomb on the opposition-held town of Khan Sheikhun, releasing the deadly nerve agent that killed more than 80 people, including children.
Russia also lambasted the investigators for not travelling to the Shayrat air base, from where the aerial attack on the northwestern Syrian town was allegedly launched.
But Ward accused Russia of "collaborating with the (Bashar al-)Assad regime in a deplorable attempt to discredit the (OPCW) Fact Finding Mission (FFM) and the Joint Investigative Mechanism."
"Regrettably, Russia has abetted Syria's use of chemical weapons and disregarded the international responsibilities Syria undertook," Ward said in a statement posted on the OPCW's website.
The draft resolution "decides to renew the work by the FFM on the incident with the use of chemical weapons in Khan Sheikun in order to ensure a full-scale, professional and high-quality investigation to identify sarin," according to a copy seen by AFP.
It also asks for the fact-finding team to hold back the results of its new probe "until (a) full-scale investigation on the site of the incident in Khan Sheikhun becomes possible".
The investigators "have not taken any evidence they can't corroborate from at least three sources," Wilson told AFP.
Earlier in his statement to the OPCW's Executive Council meeting -- of which Russia and the United States are also members -- Wilson accused Russia and Iran of "seeking to politicise" the OPCW.
"It is a thinly veiled political attack on the professional integrity" of the OPCW's director general Ahmet Uzumcu aimed at undermining the organisation's technical capability and competence, Wilson said.
Disclaimer: No Business Standard Journalist was involved in creation of this content
