"These steps aim to bolster
North Korea's national security and do not threaten neighboring states,
including Russia," the North Korean diplomat said.
website reference: Interfax at http://www.interfax.com/3/203865/news.aspx
Vladivostock has been a long standing end to the Russian Oil pipeline.
It is virtually inaccessibly by any military force. It is nestled at the border of North Korea and bearing off China's north eastern most border. China alone stands the most to gain by protecting the existing and neighboring oil supplies.