LONDON — A chemical weapons watchdog amended statements on Friday that its leader had given to The New York Times, through which he estimated that 50 to 100 grams of liquid nerve agent had been used within the March four assault on the previous Russian spy Sergei V. Skripal and his daughter, Yulia, in Salisbury, England.
A press release issued by the group, the Organization for the Prohibition of Chemical Weapons, mentioned the quantity needs to be measured in milligrams quite than grams.
The group went on to say that it will not be capable to estimate how a lot of the nerve agent was utilized in Salisbury.
In the interview, Ahmet Uzumcu, the director common of the O.P.C.W., described new measures to watch manufacturing of the nerve agent. Mr. Uzumcu mentioned that international locations which can be signatories to the Chemical Weapons Convention — like Russia, the United States and the United Kingdom — can be required to declare manufacturing or stockpiling of the agent, certainly one of a pressure often called novichok. However, he mentioned that international locations producing the chemical for analysis functions would produce about one-10th the quantity used within the assault.
The O.P.C.W., a worldwide physique created to supervise the elimination of stockpiles after the top of the Cold War, might add the chemical to the record of weapons it screens.
Mr. Skripal, a Russian former double agent, and his daughter collapsed on a bench in Salisbury, a metropolis in southern England, a number of hours after they had been uncovered to novichok, a nerve agent that Soviet scientists developed for battlefield use in opposition to Western troops.