I think you meant to ask: What country began trading opium with china?
The answer to that is: England. They trade opium with china in return for tea.
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China
The establishment of spheres of influence in China by Europeans! :)
China
They had many countries under control with the power that they had from trading opium. These countries were mainly who they interacted with and communicated with. This allowed them to not get involved in anything in the west.
The treaty of Nanking was signed in 1842 and ended the First opium war between China and Britain and its results included the destruction of the Chinese navy.