US President Joe Biden said Thursday the world is facing nuclear "Armageddon", warning that Vladimir Putin may use his atomic arsenal as Russian troops struggle against a Ukrainian counteroffensive.
After Russia's invasion eight months ago, Putin has made thinly veiled threats to use nuclear weapons if he feels he has run out of options in his bid to seize swaths of Ukrainian territory in the face of stiff resistance by Western-back Kyiv, AFP said.
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