It may be another case of the adage: The enemy of my enemy is my friend. Either way, it has come as a welcome surprise for China to see its top global rival, the United States, pick a fight with Beijing's biggest Asian competitor, India. Relations between Washington and New Delhi are on the fritz after the Trump administration threatened this month to double tariffs on Indian goods to a whopping 50%, citing India's imports of Russian oil. The sudden rift threatens to undermine years of growing cooperation between the United States and India in areas like security and technology that had been fueled in large part by a shared desire to keep China's global ambitions in check. It has also injected new momentum into an easing of tensions between China and India, which had ramped up in recent ye