By Anthony Deutsch AMSTERDAM (Reuters) – Ukrainian President Volodymyr Zelenskiy has expressed concern that Russia could deploy chemical weapons in the war and there has been an unconfirmed report of their use in the besieged southern port of Mariupol. Chemical weapons production, use and stockpiling is banned under the 1997 Chemical Weapons Convention (CWC). Only Egypt, North Korea and South Sudan have not signed or ratified the international arms control treaty. Israel has signed but not ratified. The convention is overseen by the Organisation for the Prohibition of Chemical Weapons (OPCW) i…

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