An introduction of J-31 fighter in the Chinese arsenal is another indication that China is on the move to flex its muscles which ought to be taken very seriously by its neighboring countries in the East China and South China sea.  If one looks at the competitive nature of air force and military strength of the neighboring countries, one can infer that China does not need the stealth fighters to defeat those small countries.  Hence, China is gearing up to face the security forces of Japan and India - the two major competitive forces in the region.  Therefore, the development of these stealth fighters ought to be of serious concern to both India and Japan.  As we know, China has an insatiable territorial expansion desire to establish its hegemonic status in that part of the world, and there is an urgent need to counter balance that power vacuum.  Of course, China wants to settle the score with Japan on the disputed Islands issue along with establishing its territorial rights on the natural oil and gas resources in that part of the sea.  In addition, China sees India a major hurdle in its way to becoming a super power in that region.  It is true that India has lot of joint defense ventures going on with the technical know-how of Russia, but in the event of a major military escalation between China and India, one is not sure which way the Russian government will show its tilt.  Although it is not fair to presume anything conclusively predicated on hypothesis, but India ought to have a 'Plan B' in case Russia does not support India with full military might against China.  Since the USA is also interested in counter-balancing the power vacuum in that part of the world, it is an opportune time to join hands with the USA and Japan to thwart any major threat from China.  INDIA NEEDS TO BE PROACTIVE AND WATCHFUL OF ALL THE MILITARY MOVES OF CHINA.