The OPCW-U.N. Joint Investigative Mechanism (JIM) in Syria has released a report. It links the Syrian government to the use of chemical weapons in at least three instances. But Russia says the report is unconvincing.

“We believe that the proof is not there for any big punitive action to be taken; it’s simply not there,” said Vitaly Churkin, Russian ambassador to U.N.

JIM chief Virginia Gamba has defended the investigators’ professionalism. She says they stand firmly behind their assessment and conclusions. Gamba points out that in the case of Qmenas, on March 16, 2015, the leadership panel has sufficient information to conclude that the Syrian Arab Armed Forces helicopter dropped a device from a high altitude, which hit the ground and released a toxic substance.

In the cases of Kafr Zita, on April 18, 2014; and Binnish, on March 24, 2015; the panel has determined that status of both cases remains unchanged.