UK lab says cannot determine spy nerve agent was Russian-made

The British military facility analysing the nerve agent used to poison a spy said on Tuesday it could not prove the substance was made in Russia, as Russian President Vladimir Putin put his hopes in a meeting with the world's chemical weapons watchdog.Gary Aitkenhead, chief executive of the Porton Down defence laboratory, told Britain's Sky News that analysts had identified the substance as military-grade Novichok, the word used for a category of nerve agents developed in Soviet times."It is our