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Ukraine's interior Minister has said they are Russian naval troops, they also put up the flag of Russian naval troops. Russia is denying they are Russian troops.

A man called Vladimir told Reuters he was a volunteer helping the group there, though he said he did not know where they came from.

"I'm with the People's Militia of Crimea. We're simple people, volunteers," he said.

Simple people with army trucks and machine guns. OK.

If they are militia, where are they getting the kit from?