THE spectacle of India and Pakistan teetering on the threshold of war and then backing off is both alarming and familiar. This time the odds remain in favour of de-escalation, as before. Yet the past two weeks show that relations between the two nuclear powers, which have flared into open conflict four times since partition in 1947, are increasingly unstable and dangerous. It is more important than ever that the two sides address their differences, including Pakistan’s reckless indulgence of militant groups, which threatens itself and India.