Pro-Russians enter Crimea naval base

Pro-Russian activists have entered a Ukrainian naval base in the Crimean city of Sevastopol, the BBC reports.

Russian flags have been seen flying from buildings, the headquarters of the Ukrainian navy.

An officer inside the Sevastopol base told the BBC that some 200 pro-Russian activists had broken down the gates of the base and gone inside, using an ambulance.

The senior Ukrainian officer at the scene was negotiating with them, he said.

There have been no reports of clashes or shots being fired.

Ukrainian navy spokesman Sergiy Bogdanov told AFP news agency: "There are about 200 of them, some wearing balaclavas.

"They are unarmed and no shots have been fired from our side. The officers have barricaded themselves inside the building," he said.