OPCW reports Ukraine sample findings and funding strain as UK presses Syria work

The Organisation for the Prohibition of Chemical Weapons said at its Executive Council session in The Hague on 6 October that laboratories had found the riot-control agent CS in samples from Ukraine, while warning that the findings alone do not establish its use in warfare. In a statement published on 7 October, the UK called for continued work on Syria’s chemical weapons programme. The council is meeting from 6 to 9 October, with funding pressures also on its agenda.

What the OPCW found in samples from Ukraine

OPCW Director-General Sabrina Dallafior said the organisation had carried out three technical-assistance visits to Ukraine. Designated laboratories confirmed the presence of CS in samples collected along lines of confrontation. That is a finding about the samples, rather than a determination of how the agent came to be there or whether it was used in combat.

Dallafior expressly cautioned that sample analysis alone cannot establish the use of riot-control agents as a method of warfare. At Ukraine’s request, she said, the OPCW is providing technical expertise to support Ukraine’s national investigation. The distinction matters because the laboratory result and a conclusion about events on the battlefield answer different questions.

Why the OPCW warned about its finances

The director-general also told member states that late or partial payments of assessed contributions were affecting the organisation’s work. By October, the OPCW had received less than 65% of its assessed contributions for 2026, although more than three-quarters of the year had passed. She said the Secretariat had fully drawn down its Working Capital Fund.

Syria’s destroyed munitions and unresolved declaration

The UK statement welcomed the destruction of 42 Syrian munitions in August. Arms Control Today reported that the OPCW had verified the irreversible destruction of 42 aerial bombs. That verified operation is a concrete step in dealing with Syria’s chemical weapons legacy, but it does not settle the outstanding questions about the former government’s programme.

According to Arms Control Today, UN officials said 19 of 26 outstanding issues concerning Syria’s initial chemical weapons declaration remained unresolved. The UK said further work was needed to verify destruction of programme remnants, investigate past use, identify perpetrators and hold them accountable. Those tasks extend beyond the destruction of the 42 bombs.

In July, the OPCW Executive Council restored Syria’s rights and privileges, which had been suspended since 2021. The OPCW said 67 states co-sponsored the decision and it was adopted by consensus. It linked the earlier suspension to the former Syrian government’s failure to declare the full scope of its programme and confirmed chemical weapons use on Syrian territory. The council said the newer Syrian authorities had taken steps to cooperate with the OPCW.

Practical questions remain about further destruction. In a September webinar reported by Arms Control Today, Syrian ambassador Mohamad Katoub said Syria and its partners were planning future deployments and methods. He cited national capacity, infrastructure and safety measures as obstacles for other categories of material, and said destruction in another country could be considered if domestic methods were unsuitable. Denmark’s deputy representative Sandra Jensen Landi welcomed progress but urged sustained international support to resolve the declaration issues.

What the council still has to decide

The UK also backed a draft decision to establish a network of laboratories for biotoxin analysis, saying it could help identify and attribute such agents if used. Dallafior said the OPCW’s Scientific Advisory Board had helped shape a proposed proficiency test and urged states to adopt the draft. The statements describe proposals before the council, not decisions already taken at the 6–9 October session.