Since the partition of British India in 1947 and creation of modern States of India and Pakistan, the two South Asian countries have been involved in four wars, including one undeclared war, and many border skirmishes and military stand-offs.
The Kashmir issue has been the main cause, whether direct or indirect, of all major conflicts between the two countries with the exception of the Indo-Pakistani War of 1971 where conflict originated due to turmoil in erstwhile East Pakistan (now Bangladesh).
While you didn't provide us with any concrete answers, this relationship is something related to an alliance, but in reality isn't one because the smaller country is only doing this because they're afraid of repercusions.
Answer:
International trade left to its natural course without tariffs, quotas, or other restrictions.
