Kiev said it was dispatching its defence minister but Crimea's regional leader said he would be barred from entry amid mounting tensions in a region at the epicentre of the worst East-West standoff since the Cold War.
Dozens of despondent Ukrainian soldiers -- one of them in tears -- filed out of the Ukraine's main navy base in the Black Sea port city of Sevastopol after its storming by hundreds of pro-Kremlin protesters and Russian troops.
"I was born here and I grew up here and I have been serving for 20 years," he said as a Russian flag went up over the base without a single shot being fired in its defence. "Where am I going to go?"
A Russian forces' representative said that Ukraine's navy commander Sergiy Gayduk -- appointed after his predecessor switched allegiance in favour of Crimea's pro-Kremlin authorities at the start of the month -- had been detained.
"He was blocked and he had nowhere to go. He was forced out and he has been taken away," Igor Yeskin told reporters.
He said they used a tractor to ram open the gate and were now in a standoff with Ukrainian troops.
The Ukrainian government dispatched acting Defence Minister Igor Tenyukh and First Deputy Prime Minister Vitaliy Yarema to the region for urgent mediation talks.
But Crimea's self-declared prime minister Sergei Aksyonov told the Interfax news agency while on a visit to Moscow that "no one will let them into Crimea and they will be sent back.
