NHK World

Following the earthquake/tsunami disaster last March, I followed the news from Japan on NHK World, broadcast in BSkyB’s satellite system. Latterly, NHK World has dropped off the SD BSkyB system, but it’s still available in HD (channel 507 on Sky boxes), or in SD at 13 deg. E, 11137 H on the European satellites.
If you don’t want to invest in satellite hardware, you can also watch it streamed (rather jerkily) online.