Russia and Saudi Arabia are rethinking their economies.Alexey Nikolsky/Pool/AFPOil prices ended down 7% last week and are lower this year-to-date, despite Middle East tensions.China's economic downturn, the US shale boom, and clean energy are contributing to current oil price trends.Oil market dynamics have changed so much that Saudi Arabia and Russia are diversifying their economies.The oil markets aren't what they used to be, and two of the world's biggest producers of the commodity are feeling the pressure.Oil prices have been depressed this year because China — the world's largest oil importer — is in a prolonged economic downturn.