Pakistan v India. They have fought 4 wars since 1947 and as recently as 2002 they have been on the verge of war. The likely story goes something like this. A Pakistan backed Islamic terrorist organization launches series of large scale attacks in India. Indian public opinion swings in favour of large scale military action. India launches 300000 troops across the border, Pakistan appeals to its ally China. China worried that Indian success could mean, not only their main rival for global economic dominance gets stronger but their own territorial gains made during the 1962 Chinese invasion of India come under threat. China begins moving troops towards the border. India seeing the threats uses her navy to block oil supplies going to China from the middle east. China finding its oil supply blockaded but with 1/2 million troops a few hours drive from the central Asian oil fields, mainly controlled by India's ally Russia. Now you have 2 minor nuclear powers and 2 major nuclear powers shooting at each in very quick space of time.