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Ukraine says wet weather and difficult terrain is complicating its advance in the southern Kherson region. Kyiv’s forces are piling pressure on Russian troops. But the prospect of another battlefield setback for President Vladimir Putin has fuelled fears the Kremlin could use a nuclear weapon. Al Jazeera’s @Harry Fawcett reports from Kyiv, Ukraine. – Subscribe to our channel: http://aje.io/AJSubscribe – Follow us on Twitter: https://twitter.com/AJEnglish…