By Kevin Buckland TOKYO (Reuters) – The euro sank to a three-week low to the safe-haven dollar on Thursday while riskier commodity-linked currencies like the Australian dollar weakened amid intensifying fears that a full-scale Russian invasion of Ukraine was imminent. The rouble held near a two-year trough, sterling touched its weakest level in more than a week, and bitcoin sank to a one-month low after Russian President Vladimir Putin said he had authorised military action in Ukraine’s breakaway region of Donbass. Markets had already been put on alert after U.S. Secretary or State Antony Blin…

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