New Delhi, Jan. 14 -- President Donald Trump's control of Venezuela's oil supply increases U.S. influence in the world oil market, but China is the major power that has been keeping prices steady.

The U.S. incursion into Venezuela and Trump's declaration that the U.S. now runs the country and its oil highlight the complicated relationship between the U.S.-the world's largest oil producer-and China, the biggest importer.

Oil prices have fallen during the past three years, and may continue to do so if there is no political disruption to supplies. The oil market is oversupplied by as much as 500,000 barrels to well over two million barrels a day this year, depending on who you ask.

But the one thing analysts agree on is that China has bee...