I think China and India have to keep their interest behind their option to stay reluctant and silent over crisis in Myanmar.

The growing requirement of oil of China has competency to seek the source and is in planing to build the pipeline in Myanmar, besides Myanmar would become alternative route for oil supply from west Asia and Africa and cut off its dependency from current route of Street Malacca wedged between Malaysia and Indonesia.

ASEAN actually can urge Myanmar to implement the better democracy and may sanction them from the membership. However the neighbor countries as individual has its importance on Myanmar and this might have put them in silence besides the reluctant of interfering others.

Just for reference
http://www.iht.com/articles/2005/04/13/news/edvatik.php