Key point: The Indian-Pakistani border is one of the world's most dangerous.
While the United States is preoccupied by the threat of nuclear weapons in the hands of potential adversaries such as Russia, China or North Korea, the danger of nuclear conflict may actually be greatest between two of its allies, Pakistan and India. The two nations have engaged in four wars starting since their partition along religious lines in 1947. A fifth could be drastically more costly, as their nuclear capabilities continue to grow and diversify.
Several years ago I made the acquaintance of a Pakistani nuclear science student in China. Curious about the thinking behind his country’s nuclear program, I asked if he really believed there was a possibility that India would invade Pakistan. “There’s still a lot of old-school thinkers in the Congress Party that believe India and Pakistan should be united,” he told me.
I doubt there are many observers outside of Pakistan who believe India is plotting to invade and occupy the Muslim state, but a feeling of existential enmity persists. The third conflict between the two countries in 1971 established India’s superiority in conventional warfare—not unexpectedly, as India has several times Pakistan’s population.
The bone of contention has always been the Indian state of Jammu and Kashmir. At the time of partition, the predominantly Muslim state was politically divided over which nation to join. When Pakistani-allied tribesmen attempted to force the issue, the Hindu maharaja of the region chose to accede to India, leading to the first war between India and Pakistan. Ever since, the line of control between the Indian and Pakistan side has remained bitterly contested, with artillery and sniper fire routinely exchanged. Pakistan intelligence services have infiltrated insurgents and plotted attacks across the border for decades, and Indian security troops have been implicated in human-rights violations and killings of the locals as a result of their counterinsurgency operations.