Answer:
They're involved in trades and alliance with them.
Step-by-step explanation:
During the early period of their development, Ancient Empires in Southeast Asia and Korea were typically weaker compared to the empires in India and China. But since they're located far from one another, the empires In India and China can't really conquered them.
But they do established a good trade relationships that help Early South East Asian and Korean Kingdoms accumulate wealth. They sold various type of products such as silks, spices, timbers, etc.