The big oil countries are coordinating on oil investments. Find out what that could do to the U.S.: Russia's President Vladimir Putin (R) toasts with Saudi Arabia's Ambassador to Russia Abdulrahman Al-Rassi after receiving a diplomatic credential from him during a ceremony at the Kremlin in Moscow, Russia.Reuters/Sergei Karpukhin Russia has directly offered to invest in the upcoming Aramco IPO, supporting the efforts of Saudi Crown Prince Mohammed bin Salman (MBS) to diversify the economy of the kingdom.