Armed men, believed to be Russians, march at their camp near the Ukrainian military base in Perevalnoye outside Simferopol March 17, 2014. Ukraine's parliament, seeking to boost the country's military force in the face of Russia's takeover of the Crimea peninsula, endorsed a presidential decree on Monday to carry out a partial mobilisation involving 40,000 reservists.

Washington - Russian 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 Tuesday.

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. - Reuters