“A plunge in oil prices has sent tremors through the global political and economic order, setting off an abrupt shift in fortunes that has bolstered the interests of the United States and pushed several big oil-exporting nations — particularly those hostile to the West, like Russia, Iran and Venezuela — to the brink of financial crisis,” the New York Times reports.  

“The nearly 50 percent decline in oil prices since June has had the most conspicuous impact on the Russian economy and President Vladimir V. Putin… But the ripple effects are spreading much more broadly than that. The price plunge may also influence Iran’s deliberations over whether to agree to a deal on its nuclear program with the West; force the oil-rich nations of the Middle East to reassess their role in managing global supply; and give a boost to the economies of the biggest oil-consuming nations, notably the United States and China.”