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Ukraine is drawing up plans to withdraw its soldiers and their families from Crimea, Kiev's security chief says, according to the BBC.

Andriy Parubiy said they wanted to move them "quickly and efficiently" to mainland Ukraine.

Earlier, pro-Russian forces seized two naval bases - including Ukraine navy's HQ - in Crimea. Kiev says its navy chief has been detained.

It comes a day after Crimean leaders signed a treaty with Moscow absorbing the peninsula into Russia.

A referendum in Crimea on Sunday, approving its split from Ukraine, came nearly a month after Kiev's pro-Russian President Viktor Yanukovych was replaced by Western-leaning interim authorities.

Mr Parubiy, in a news conference, set out more details on Kiev's position in light of the events in Crimea.

He said arrangements were now being set up to introduce visas for Russian nationals travelling to Ukraine.

And he said Kiev was seeking UN support to "proclaim Crimea a demilitarised zone", which would involve the withdrawal of Russian troops and the "relocation of Ukrainian troops to continental Ukraine as well as facilitate evacuation of all the civilian population who are unwilling to remain on the occupied territory."

Ukraine is also leaving the Moscow-led Commonwealth of Independent States (CIS) alliance, and is preparing for military exercises with the US and the UK, Mr Parubiy added.

With reference to plans to withdraw troops and their families, Ukraine's interim Foreign Minister Andriy Deshchytsya told the BBC that they would not be forced to leave if they did not want to.

But he said: "The situation is unpredictable and uncontrolled sometimes, so that's why there is a danger also for the civilians."