Ukraine says Russia has sent in thousands of extra troops | Reuters

Ukraine's defence minister said on Saturday Russia had "recently" brought 6,000 additional personnel into Ukraine and that the Ukrainian military were on high alert in the Crimea region.

Ukraine says it will not bow to Russian provocations in Crimea | Reuters

Ukraine's prime minister said on Saturday his country would not be drawn into a military conflict by Russian "provocations" in the Crimea region and appealed to Moscow to halt military movements there.

"It is unacceptable when armoured Russian military vehicles are out in the centre of Ukrainian towns," Arseny Yatseniuk said before a government meeting in the Ukrainian capital, Kiev.