Vladimir could resort to using Novichok in mass attacks in Ukraine if his troops continue to lose ground, US officials have warned.As the progress of the war has gone increasingly in 's favour, fears that the Russian despot could take extreme measures to force Ukraine to surrender - such as launching a nuclear strike or a dirty bomb attack - have been rising.But according to six people with knowledge of the matter, Putin is prepared to use chemical weapons in a mass-casualty event before resorting to a nuclear confrontation with .
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