China-Japan tensions 'still high'

The territorial dispute between China and Japan shows little sign of abating.

On Monday, a number of Chinese ships entered waters near the disputed Senkaku - or Diaoyu - islands and remained there for 12 hours. Some fear that an accidental collision could escalate tensions still further.

Mariko Oi asked the head of Japan's Maritime Self Defence Force, Katsutoshi Kawano, if he feels under pressure.