Ukraine's acting defence minister says Russia is continuing its build-up of troops in Crimea.
Ihor Tenyukh says they now number up to 22-thousand servicemen, almost double the number allowed under an agreement between Russia and Ukraine.
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News of the build-up comes as voters on the peninsula vote in a referendum on whether to re-join Russia.
It's expected the majority of voters in the largely Russian-speaking region will accept the proposal.
Moscow claims the referendum complies with international law.
But, Ukraine's Deputy Foreign Minister Danylo Lubkivsky disagrees.
