WASHINGTON - Russia could face additional sanctions if it proceeds with formal annexation of Ukraine's Crimea region or takes further military action in Ukraine, a senior US official said on Monday.

There is "concrete evidence" that some ballots arrived "pre-marked" in Sunday's secession referendum in Crimea and other voting anomalies were also detected, another US official said after Washington announced visa bans and asset freezes on 11 Russian and Ukrainian officials.


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